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Rufina [12.5K]
3 years ago
13

Which statement about Eduardo’s calculations is true?

Mathematics
1 answer:
jeyben [28]3 years ago
3 0

Answer:

"Eduardo did not use the correct formula for the circumference"

Step-by-step explanation:

The circumference formula is  C = 2πr

Area formula is  A=πr^2

Volume formula is correct. The steps area also correct to find r, the radius.

But in the end, he put the formula for circumference wrong. He used the formula for Area, NOT Circumference.

Hence, "Eduardo did not use the correct formula for the circumference" should be the correct choice for this question.

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Answer:

-7\dfrac12

Step by step explanation:

-7.5=-\dfrac{75}{10}=-\dfrac{15}2=-7\dfrac{1}2

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Answer:

b

Step-by-step explanation:

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3 years ago
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Anna has a 25-meter-long fence that she plans to use to enclose a rectangular garden of width w. The fencing will be placed arou
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<h3>Answer:   -2w^2 + 25w = 25    or    -2w^2 + 25w - 25 = 0</h3>

================================================================

Explanation:

Refer to the diagram below. The width is w. We have two opposite and parallel sides equal to this. The other two parallel congruent sides are L = 25-2w meters long. We start with the total amount of fencing, and then subtract off the two width values, so 25-w-w = 25-2w.

The area of the rectangle is

Area = length*width

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Set this equal to the desired area (25 square meters) to get

-2w^2 + 25w = 25

and we can subtract 25 from both sides to get everything on one side

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side note: The two approximate solutions of this equation are w = 1.0961 and w = 11.4039 (use the quadratic formula or a graphing calculator to find this)

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Answer: The percent changed because it increased by 180%.

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