can someone help me please i don't understand this

The values of the two numbers of the system of equations is x = 6 and y = -9.

First, we are told that "three times the sum of two numbers is 15". This can be written as:

3(x + y) = 15

Next, we are given that "one of the numbers is 9 more than one-third of the other number". We can break this down into two parts:

"one of the numbers": this refers to either x or y, but we don't know which one yet. Let's assume that it refers to x.

"9 more than one-third of the other number": this means that we take one-third of the other number (y), add 9, and that gives us x. In equation form, this is:

x = (1/3)y + 9

Now we have two equations with two variables:

3(x + y) = 15

x = (1/3)y + 9

We can use these equations to solve for x and y. There are different methods for solving a system of equations, but one common method is substitution.

Using the second equation, we can solve for x in terms of y:

x = (1/3)y + 9

3x = y + 27

y = 3x - 27

Now we can substitute this expression for y into the first equation:

3(x + y) = 15

3(x + 3x - 27) = 15

Simplifying this equation gives:

12x = 72

x = 6

Finally, we can use the equation we found for y in terms of x to find the value of y:

y = 3x - 27

y = 3(6) - 27

y = -9

So the two numbers are x = 6 and y = -9.

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A minimum score of 88.95 is required to receive an "A" grade on the exam.

To determine the minimum score required to receive an "A" grade on an exam, we must first understand the meaning of standard deviation and mean. The mean is the average of a set of values, whereas the standard deviation is a measure of how far apart the values are from the mean. The minimum score required to receive an "A" grade is determined by calculating the z-score that corresponds to the top 12.3 percent of exam scores.

The formula for calculating the z-score is given as: z = (x - μ)/σ, where x is the raw score, μ is the population mean, and σ is the population standard deviation. Solving for z, we have: z = invNorm(1 - 0.123) = invNorm(0.877) ≈ 1.15. The inverse normal distribution function is used to determine the value of z that corresponds to the area to the right of the z-score. We can then use the formula for the z-score to solve for the raw score (x):
x = zσ + μ
Substituting the values we have, we get:
x = 1.15(17) + 68 ≈ 88.95
Therefore, a minimum score of 88.95 is required to receive an "A" grade in the exam.

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The triangle has sides; a = 11.3 ft, b = 9.03 ft, and c = 12.9 ft. 1

Angles of approximately A = 59°, B = 51°, and C = 70°

Triangle is a shape of three line segments these segments have three points which crosses it.

The Law of Cosines states that;

c² = a² + b² - 2ab Cos(C)

put values;

12.9² = 11.3² + b² - 2(11.3)(b) Cos(C)

166.41 = 127.69 + b² - 22.6b Cos(C)

b² - 22.6b Cos(C) - 38.72 = 0

We know the quadratic formula, solve it for value of b:

b = [-22.6 Cos(C) ± [tex]\sqrt{(22.6Cos(C))^2 - 4*1*(-38.72)))[/tex]] / (2×1)

b = -11.3 Cos(C) ± [tex]\frac{\sqrt{510.76 Cos^2(C) + 154.88}}{2}[/tex]

To solve for the angles A and C, we can use the Law of Sines, which states that for any triangle with sides of lengths a, b, and c, and its opposite angles which are A, B, and C, So the equation is:

sin(A)/a = sin(B)/b = sin(C)/c

We know that c = 12.9 ft and a = 11.3 ft, and we have just found b, so we can use the Law of Sines to solve for the angles A and C.

sin(A)/11.3 = sin(C)/12.9

sin(A) = (11.3/12.9)sin(C)

sin(A) = 0.875969

A = [tex]Sin^{-1}(0.875969)[/tex]

A ≈ 59° (rounded to the nearest minute)

Now we can use the fact that the sum of the angles in a triangle is 180° to solve for C:

C = 180° - A - B

C = 180° - 59° - [tex]Sin^{-1}[/tex]([22.6cos(C) ± [tex]\sqrt{(511.56 - 154.88 Cos^2(C)) }[/tex]] / 2)

We can use a numerical solver to find the value of C that satisfies this equation. One possible value for C is:

C ≈ 70° (rounded to the nearest minute)

Finally, we can use the Law of Sines again to find the other angle B:

Sin(B)/b = sin(C)/c

Sin(B) = (b/12.9)sin(C)

Sin(B) = (b/12.9)sin(70°)

B = [tex]Sin^{-1}[/tex]((b/12.9)sin(70°))

By putting the value of b,

B ≈ 51° (rounded to the nearest minute)

Therefore, the triangle has sides of lengths 11.3 ft, approximately 9.03 ft, and 12.9 ft, and angles of approximately 59°, 51°, and 70°.

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Based on the attached figure, the volume of the composite figure is 408 cm³

A composite figure is a three-dimensional shape that is made up of two or more simpler shapes.

To find the volume of a composite figure, you need to break it down into its simpler shapes and then use the appropriate formulas to calculate the volume of each individual shape

The volume of the composite figure is:

Volume = area of base * height

Substituting:

Base area = (14 * 3) + (1/2)(5 + (14-6))(7 - 3) = 68 cm²; height = 6 cm

So, we have

Volume = area of base * height = 68 cm² * 6 cm = 408 cm³

This means that

The volume is 408 cm³

Hence, the volume is 408 cm³

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Answer:

  about 0.40

Step-by-step explanation:

You have ...

and you want to know the probability a turbine is faulty if it fails the test.

The probability a turbine will fail the test is the sum of the probabilities a good turbine will fail, and that a bad turbine will fail.

  p(good & fail) = p(good)×p(good fails) = 0.98×(1 -0.97) = 0.0294

  p(bad & fail) = p(bad fails)×p(bad) = (1 -0.01)×(1 -0.98) = 0.0198

Then the probability a tested turbine will fail is ...

  p(fail) = p(good & fail) +p(bad & fail) = 0.0294 +0.0198 = 0.0492

The probability that a turbine is faulty given that it failed the test is ...

  p(bad | failed) = p(bad & fail)/p(fail) = 0.0198/0.0492 ≈ 0.4024

The probability a turbine is faulty if it fails the test is about 0.40.

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Out of a random sample of 1,000 Dutchmen, we would expect around 63 to be taller than 188 cm. This can be determined by using the standard normal distribution and probability, expecting the 159 Dutchmen to be taller than 188 cm

The standard normal distribution is a normal distribution with a mean of 0 and a standard deviation of 1. A normal distribution is a bell-shaped curve that is symmetrical around the mean. A normal distribution is used to model various natural phenomena.

Probability is the likelihood or chance of an event occurring. Probability is usually expressed as a fraction, decimal, or percentage. Probability is used in many fields such as mathematics, physics, statistics, and finance.

The given problem can be solved by converting 188 cm to a z-score and then finding the probability using a standard normal distribution table.

The z-score formula is given by:

z = (x - μ) / σwhere x = 188, μ = the mean height of Dutch men, and σ = the standard deviation of height for Dutchmen.

Let's assume that the mean height of Dutchmen is 180 cm and the standard deviation is 8 cm.

z = (188 - 180) / 8

z = 1

Therefore, the z-score for a height of 188 cm is 1.

Using a standard normal distribution table, we can find the probability of a man being taller than 188 cm as approximately 0.1587.

Therefore, in a random sample of 1,000 Dutchmen, we would expect approximately 0.1587 x 1,000 = 158.7 men to be taller than 188 cm. Rounded to the nearest integer, we would expect 159 Dutchmen to be taller than 188 cm.

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The student's original statement has an issue in the way the "not" operator is used. The "not" operator (!) is negating the entire expression, including the variable 'x', rather than just the inequality. This leads to incorrect evaluation.

To correctly determine if x is not greater than 20, you should use the "less than or equal to" (<=) operator instead. Here is the corrected statement:

if (x <= 20)

This statement will be true if x is less than or equal to 20, which is the intended condition.

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The altitude of drone is 8.4ft.

The angle generates in between the horizontal line and the line of sight when an observer looks upward is referred to as the angle of elevation in mathematics. It is always greater than the observer and at a larger angle.

The term "angle of depression" defined as the angle created when an observer looks down at an item and the horizontal line intersects with the line of sight. It gauges how our area of vision shifts as we see down.

In the given figure,

∠DTL=35°

LT=12ft

tan35°=DL/LT

tan35°=DL/12

DL=8.4ft

Hence, The altitude of drone is 8.4ft.

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The conical mound of soil therefore contains 254.34 cubic meters of substance.

How much a receptacle contains can be determined by looking at its volume. Volume is calculated as follows: volume = length x breadth x height.

The following is the algorithm for a cone's volume:

V = (1/3)πr²ⁿ

where,

Substituting the given values, we get:

V = (1/3) x 3.14 x 9²*³

V = 254.34 cubic meters

Therefore, there are 254.34 cubic meters of material in the conical pile of dirt.

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A dummy variable is used as an independent variable in a regression model when the variable involved is nominal.

What is a dummy variable?A dummy variable, also known as an indicator variable, is a binary variable (having only two possible values). It is used to distinguish between groups or categories. It is used to investigate the effect of the predictor on the response in regression analysis.

In a regression model, a dummy variable is used as an independent variable when the variable involved is nominal. In regression analysis, the independent variable is the variable that is being tested to determine if it has a relationship with the dependent variable (the outcome variable).

The independent variable is also referred to as the predictor variable, while the dependent variable is referred to as the response variable.  

Thus, the answer is: the variable involved is nominal

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The given interval suggests that the mean number of porcupine teeth marks on all wooden blocks treated with the repellent is less than 6 since the upper limit of the interval is 5.8. This claim falls within the given interval and is supported by the data. Therefore, we can say that the mean number of porcupine teeth marks on all wooden blocks treated with the repellent is less than 6 based on the 95 percent confidence interval (4.9,5.8).

In the given scenario, a sample of 20 wooden blocks treated with a liquid repellent designed to reduce damage caused by porcupines were left outside in an area where porcupines are known to live. After some time, the blocks were inspected for the number of porcupine teeth marks visible. The data collected was then used to create the 95 percent confidence interval (4.9,5.8).

The 95 percent confidence interval can be defined as a range of values that we can be 95 percent confident the true population parameter falls within. In this case, the true population parameters is the mean number of porcupine teeth marks on all wooden blocks treated with the repellent.

From the given interval, we can conclude that we are 95 percent confident that the true mean number of porcupine teeth marks on all wooden blocks treated with the repellent is between 4.9 and 5.8.

Therefore, any claim that falls within this interval is supported by the data.

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Answer:

3000

Step-by-step explanation:

you would multiply 500 times 60 because there are 60 minutes per hour

SSS, or Side-Side-Side Similarity, is what makes these two triangles alike.

A right triangle's hypotenuse is its longest side, its "opposite" side was the one that faces a specific angle, and its "adjacent" side is the one that faces the angle in question. To define the edges of right triangles, we use specific terminology.

A triangle represents a closed, three-sided object in two dimensions. The various kinds of circles go by various titles. Three different kinds of triangles—scalene, isosceles, and equilateral—are distinguished by the lengths of their sides.

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Answer:

Step-by-step explanation:

To find the equation of a line when you have two points, you can use the point-slope formula. Here's how to do it:

1. Find the slope of the line using the two points:

slope = (y2 - y1) / (x2 - x1)

where (x1, y1) = (0, 3) and (x2, y2) = (5, 3)

slope = (3 - 3) / (5 - 0) = 0/5 = 0

2. Use the point-slope formula to find the equation of the line:

y - y1 = m(x - x1)

where m is the slope, and (x1, y1) is one of the points on the line. Using (0, 3) as the point, we get:

y - 3 = 0(x - 0) or y = 3

So the equation of the line is y = 3, a horizontal line passing through y = 3.

The domain of this equation is all real numbers, since x can take on any value and y will always be 3.

The range of this equation is a single value, y = 3, since the line is horizontal and every point on the line has the same y value of 3.

At Game 7, the attendance for the basketball team had declined by 5% x 6 games = 30% and This means that the attendance at Game 7 was 23,500 x (1 - 0.3) = 16,450 people.

The attendance for a basketball team declined at a rate of 5% per game throughout a losing season. This means that for every game, the attendance dropped by 5% in comparison to the attendance of the game before it.

15 games were played in the season and 23,500 people were at the first game. To calculate the attendance at Game 7, we first need to calculate the total amount that the attendance had declined by by the 7th game.

This can be done by multiplying the rate of decline (5%) by the number of games that had passed (6 games). This gives us a total decline of 30%. We then need to calculate the attendance at Game 7 by subtracting the total decline from the initial attendance.

This can be done by multiplying the initial attendance (23,500) by (1 - 0.3), which gives us 16,450 people. Therefore, the attendance at Game 7 was 16,450 people.

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Option C is the correct answer.

When x=-20, the argument of the logarithm is 5x=-100, which is negative. Therefore, the logarithm is not defined and -20 is not a solution to the equation.

No, -20 is not a valid solution to the equation -6 + 2log(-5x) = -2.
To verify, substitute -20 for x in the original equation:

-6 + 2log(-5(-20)) = -2
-6 + 2log(100) = -2
-6 + 4 = -2
This is not a true statement, so -20 is not a valid solution.
Furthermore, note that the argument of the logarithm in the original equation must be positive. Thus, we need to ensure that -5x > 0, which means x < 0.

To solve the equation, we can start by isolating the logarithmic term:

-6 + 2log(-5x) = -2
2log(-5x) = 4
log(-5x) = 2

Now we can exponentiate both sides using the definition of logarithms:

-5x = [tex]10^2[/tex]
-5x = 100
x = -20

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As per the median, the set of data that fulfilling Marjane's requirement is 24, 25, 25, 25, 26, 26 (option c).

In statistics, data is a collection of numbers or values that represent a particular phenomenon. One way to measure central tendency, or the typical or representative value of the data, is through the median and the mode.

The median is the middle value when the data is arranged in numerical order, and the mode is the value that appears most frequently.

The third set of data is 24, 25, 25, 25, 26, 26.

The median is the middle value, which is also (25+25)/2 = 25.

The mode is the value that appears most frequently, which is 25.

Therefore, the mode and median are the same, fulfilling Marjane's requirement.

Therefore, the correct option is (c).

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Answer: To find the mean of the data set, you need to calculate the sum of the products of each length and its corresponding frequency, and then divide that sum by the total number of roses.

Using the data set given, the sum of the products is:

(2 * 22) + (4 * 23) + (5 * 24) + (3 * 25) + (1 * 26) = 221

The total number of roses is:

2 + 4 + 5 + 3 + 1 = 15

Therefore, the mean length of the roses is:

221 / 15 = 14.73 ≈ 24 cm

So, the answer is 24 cm.

Step-by-step explanation:

Answer:

24 but the test is wrong

Step-by-step explanation:

Soooo i dont know what the answer in the test is but the answer is 24. If you add them all up, 22 23 24 25 26, you get 120 which you then divide by  5. I dont know what the test wants u to answer tho.

The answer on the number line is 1) √2,√3,√4,√5,√6,√7,√8,√9,√10 . 2). A. √62 (between 7 and 8 on the number line),B. √84 (between 9 and 10 on the number line),C.

In mathematics, perfect square is integer that is square of an integer. In other words, perfect square is  non-negative integer that can be expressed as  product of some integer multiplied by itself.

1). The first perfect square is 1, so it is already placed on the number line. The other perfect squares are:

4,9,16,25,36,49 64,81,100

You can place each of these numbers on the number line above the corresponding tick mark.

2). Place the following letters on their approximate place on the number line above.

To place each letter on the number line, you need to estimate its value based on its square root. For example, the square root of 62 is between the square roots of 49 and 64, so you can place letter A between those two numbers on the number line.

Here are the estimated values and approximate placements for each letter:

A. √62 (between 7 and 8 on the number line)

B. √84 (between 9 and 10 on the number line)

C. √23 (between 4 and 5 on the number line)

D.√34 (between 5 and 6 on the number line)

E. √54 (between 7 and 8 on the number line)

F. √12 (between 3 and 4 on the number line)

G. √77 (between 8 and 9 on the number line)

H. √45 (between 6 and 7 on the number line)

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Answer:

Karen needed to put 5 gallons 3 quarts of gas into her boat on Monday and twice as much on Saturday. To convert 5 gallons 3 quarts to gallons, we can add the number of quarts to the number of gallons and convert the total to gallons. Therefore, 5 gallons 3 quarts is equal to 5 + 3/4 = 5.75 gallons. Twice as much is 2 x 5.75 = 11.5 gallons. Therefore, Karen needed a total of 5.75 + 11.5 = 17.25 gallons of gas for both days. Since she had an 18-gallon jug of gas available, she had enough gas for both days.

By considering the absolute values of the integers, 4, 3,07, and 2.971 may be derived as a simpler set of positive numbers for the equations.

The distance a number is from zero on the number line is its absolute value. Taking a number's absolute value allows you to convert it into a positive number because it is by definition always positive. Just disregarding the sign and focusing on the size of a number allows us to determine its absolute value. This rule may be applied to each of the supplied integers in this situation, giving rise to their absolute values, which are all positive. The set of real numbers that are greater than zero in mathematics is known as the set of positive real numbers, or displaystyle'mathbb 'R' '>0'='left'x'in'mathbb 'R"mid x>0'right'.

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The total surface area of the rectangular prism is 25.92 square units.

Remember that the area of a rectangular prism whose dimensions are A, B, and C is equal to the sum of the areas of each of the faces, we can write this as:

total area = 2*[ A*B + B*C + C*A]

In this case we can write the dimensions as:

A = 2.7 units.

B = 1.8 units.

C = 1.8 units.

Then the total surface area of this prism is:

total area = 2*[  2.7 units*1.8 units.  +  2.7 units*1.8 units + 1.8 units*1.8 units]

total area = 2*[ 12.96 square units] = 25.92 square units.

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Complete question:

"Find the area of a prism whose dimensions are 2.7 by 1.8 by 1.8"

This histogram shows that the majority of the data falls between 20 and 80, with a peak around 30-35. However, it is possible that a different bin width or starting point could reveal other interesting features of the data set.

To create a histogram, you need to divide the data into intervals, also known as bins, and then count the number of data points that fall into each bin. The goal is to choose a bin width that will clearly show the distribution of the data. One common rule of thumb for choosing the bin width is to use the square root of the number of data points. In this case, the square root of 11 is approximately 3.32, so we might start by using a bin width of 4. To choose the first interval, we need to decide where to start the first bin. One approach is to start at the minimum value of the data set and then create bins of equal width that extend to the right. Another approach is to use a "nice" number, such as a multiple of the bin width, as the starting point.

  7 20

  | ||

30-| ||

  | ||

25-| ||

  | ||

20-| ||

  | ||

15-| ||

  | ||

10-| ||

  | ||

5-|_||__

   5  9

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No triangles: angle 30°,85°,60° and sides 2,8,10

One triangle: sides 7,24,25

many triangles: angle 5°,15°,160° and angle 45°, 45°, 90°

A triangle is a geometric shape that is formed by connecting three points in a plane with straight lines. It has three sides, three angles, and three vertices (or corners). The sum of the angles in a triangle is always 180 degrees. Triangles are classified based on the lengths of their sides and the measures of their angles.

Sum of angles should not be equal to 180°

Sum of two sides of triangle is not always greater than third side.

30°+85°+60°=175°<180°

Hence, this angle do not form triangle

2+8=10

Hence, this sides do not form triangles.

Sum of two sides of triangle is always greater than third side.

7+24>25

Hence, this sides do not form triangles.

Sum of angles should be equal to 180°

5°+15°+160°=180°

Hence, this angle  form triangle

45°+45°+90°=180°

Hence, this angle  form triangle.

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The complete question is:

Image is attached below.

The value that can be gotten from expression of 8 divided by 1/5 is 40.

In mathematics, division is an arithmetic operation that involves splitting a quantity or a number into equal parts or groups. It is the inverse operation of multiplication.

The division symbol is usually represented by a forward slash (/) or a division sign (÷). It is represented as "a ÷ b" or "a/b," where "a" is the dividend, "b" is the divisor, and the result is the quotient.

When we divide one number by another, we are essentially finding out how many times the divisor can fit into the dividend. For example, if we divide 10 by 2, we are asking how many times 2 can fit into 10. The answer is 5, so 10 divided by 2 is 5.

Given that  8 divided by 1/5, which can be expressed as ;

8 / (1/5)

= 8÷(1/5)

=8 * 5/1= 40

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Let's assume that Gabriella traveled $x$ hours at 30 mph and $y$ hours at 10 mph. We know that the total trip took 8 hours, so we can write an equation based on the time:

$$x+y=8$$

We also know that the distance traveled going to the restaurant is the same as the distance traveled coming back home. Let's call this distance $d$. We can use the formula $d=rt$ to express this relationship:

$$30x=10y$$

Now we have two equations with two unknowns:

$$\begin{aligned} x+y&=8 \ 30x&=10y \end{aligned}$$

We can solve for $x$ and $y$ by using substitution. Solving the second equation for $y$, we get:

$$y=3x$$

Substituting this expression for $y$ in the first equation, we get:

$$\begin{aligned} x+3x&=8 \ 4x&=8 \ x&=2 \end{aligned}$$

Therefore, Gabriella traveled 2 hours at 30 mph and 6 hours at 10 mph.

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The inverse function is R(L) = (360 - L)/15. It will take 8 weeks to pay loan if student owes $240 and 24 weeks to pay off the whole loan.

A. Let's start by defining the function L(w) as the amount owed w weeks after the student borrows the money. The student borrowed $360 and agreed to pay $15 per week, so the amount owed after w weeks can be calculated as:

L(w) = $360 - $15w

B. To find the inverse of function L, we need to switch the roles of the input and output variables. Let's call the inverse function R, where R(L) is the number of weeks it takes to pay off the loan if the amount owed is L. We can solve the equation from part A for w:

L(w) = $360 - $15w

$15w = $360 - L

w = (360 - L)/15

Therefore, the inverse function R(L) is:

R(L) = (360 - L)/15

This function tells us how many weeks it will take to pay off the loan for a given amount owed. For example, if the student owes $240, we can plug that into the inverse function to find out how many weeks it will take to pay off the loan:

R($240) = (360 - 240)/15 = 8

So it will take 8 weeks to pay off the loan if the student owes $240.

C. To find out how many weeks it will take to pay off the loan, we need to find the value of w when L(w) = 0 (i.e., when the loan is fully paid off). We can set L(w) = 0 and solve for w:

L(w) = $360 - $15w = 0

$15w = $360

w = 24

So it will take 24 weeks to pay off the loan.

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