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3 years ago

A department store buys 100 shirts at a cost of $800 and sells them at a selling price of $10 each. Find t

Mathematics

1 answer:

Pachacha [2.7K]3 years ago

8 0

Answer:

125%

Step-by-step explanation:

they sold the shirtsto the store at 8 $. they now sell for 10, so 10/8 is 125%

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Amiraneli [1.4K]

Given:

The function is

$h=3+25t-5t^2$

To find:

The values of t where h is 8 meters.

Solution:

We have,

$h=3+25t-5t^2$

Putting h=8, we get

$8=3+25t-5t^2$

$0=3+25t-5t^2-8$

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Dividing both sides by -5 and interchanging the sides, we get

$1-5t+t^2=0$

$t^2-5t+1=0$

Here, $a=1,b=-5,c=1$ .

Using quadratic formula, we get

$t=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}$

$t=\dfrac{-(-5)\pm \sqrt{(-5)^2-4(1)(1)}}{2(1)}$

$t=\dfrac{5\pm \sqrt{25-4}}{2}$

$t=\dfrac{5\pm \sqrt{21}}{2}$

It can be written as

$t=\dfrac{5-\sqrt{21}}{2}$ and $t=\dfrac{5+\sqrt{21}}{2}$

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