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3 years ago

14

Dylan has 765 cards in his baseball card collection. He sells 153 of the cards. What is the percent of decrease in the number of

cards in the collection?

1 answer:

AlladinOne [14]3 years ago

6 0

Simply divide 153 by 765 to get the percent. This equals .2

ANSWER 20%

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2 years ago

The volume of a 10 ounce box of cheerios is 258.75in3. the length of the box is 4 inches less than the height and the width is 3

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Height of the box = 11.5 in

Step-by-step explanation:

Let h be the height of the box.

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Width = 3 in

We need to find the height of the box.

Solution:

We know that the volume of the box.

$Volume = Length\times height\times width$

Substitute all given value in above formula.

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Rewrite the equation as:

$258.75 = 3h(h-4)$

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whole equation divided by 3.

$h^2-4h-86.25=0$

Use quadratic formula with $a = 1, b = -4,c=-86.25$

$h=\frac{-b\pm \sqrt{(b)^{2}-4ac}}{2a}$

Put these a, b and c value in above equation.

$h=\frac{-(-4)\pm \sqrt{(-4)^{2}-4(1)(-86.25)}}{2(1)}$

$h=\frac{4\pm \sqrt{16+345}}{2}$

$h=\frac{4\pm \sqrt{361}}{2}$

$h=\frac{4\pm 19}{2}$

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$h=\frac{23}{2}$

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For negative sign

$h=\frac{-15}{2}$

h = -7.5

We take positive value of h.

Therefore, the height of the box h = 11.5 in

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2 years ago