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Inga [223]
3 years ago
5

Mr. Martin’s math test, which is worth 100 points, has 29 problems. Each problem is worth either 5 points or 2 points. Let x be

the number of questions worth 5 points and let y be the number of questions worth 2 points. x + y = 29, 5x + 2y = 100
Mathematics
1 answer:
gavmur [86]3 years ago
6 0

Answer:

The number of questions worth 5 points is 14 and the number of questions worth 2 points is 15. 70 points can be gained from the 5 point questions and 30 points can be gained from the 2 point questions making a total of 100 points.

Step-by-step explanation:

For this problem, we have to solve for x and y. We are given two equations.

<em>x + y = 29</em>

<em>5x + 2y = 100</em>

Let's find the value of x first. We can rearrange the first equation so it'll be easier to find the value of x using the second equation.

<em>x + y = 29 → y = -x + 29</em>

Now, let's plug in this equation into the second equation.

<em>5x + 2(-x + 29) = 100</em>

Distribute 2 to (-x + 29)

<em>5x - 2x + 58 = 100</em>

Combine like terms.

<em>3x + 58 = 100</em>

Subtract 58 from 100.

<em>3x = 42</em>

Divide by 3 on both sides.

<em>x = 14 </em>

<u>So, the value of x is 14.</u>

Now, let's find the value of y. We can do this by plugging in our x into the first equation.

<em>14 + y = 29 </em>

Subtract 14 from 29.

<em>y = 15 </em>

<u>So, the value of y is 15.</u>

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Use the slope formula y2-y1/x2-x1

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igor_vitrenko [27]
<h3>Answer: Choice B</h3>

No, this is not a plausible value for the population mean, because 5 is not within the 95% confidence interval.

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Explanation:

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The question is asking if mu = 5 is plausible if the researcher found the 95% confidence interval to be 5.2 < mu < 7.8

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Step-by-step explanation:

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