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2 years ago

6

Randy collected 30 signatures from fifth grade students at his school. He noticed that 3/5 of the signatures were done in pencil

. How many of the signatures were done in pencil?
1 point
A. 3 signatures
6 signatures
12 signatures
18 signatures

2 answers:

kodGreya [7K]2 years ago

6 0

Answer:

Step-by-step explanation

18 signatures is the answer because 3/5 of 30 is 18.

Final Answer= 18 signatures

inna [77]2 years ago

3 0

Answer:

18 signatures

Step-by-step explanation:

Take the total number of signatures and multiply by the fraction that were done in pencil to determine the number done in pencil

30 * 3/5

90/5

18

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Answer:

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Step-by-step explanation:

We have that:

$Area = 128$

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Such that:

$Length = x$

$Width = y$

So:

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Substitute 128 for Area

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$Length = x + 1 + 1$

$Length = x + 2$

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$A = (x + 2) * (y + 4)$

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$A = (\frac{128}{y} + 2) * (y + 4)$

Open Brackets

$A = 128 + \frac{512}{y} + 2y + 8$

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$A = \frac{512}{y} + 2y + 8+128$

$A = \frac{512}{y} + 2y + 136$

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To calculate the smallest possible value of y, we have to apply calculus.

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Multiply through by $y^2$

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To double-check;

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$A" = \frac{1024}{y^3}$

The above value is:

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This means that the calculated values are at minimum.

<em>Hence, the dimensions of the smallest piece that can be used are: 10 by 20 and the area is 200 square inches</em>

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Step-by-step explanation:

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