2 years ago

Simplify the expression |-0.8 X 10|

Mathematics

2 answers:

Alexeev081 [22]2 years ago

4 0

- 4 x 2 = -8

steps:
-0.8= -4/5
-4/5x 10 can be simplified to
-4 x 2= -8

eduard2 years ago

3 0

I think -8 but i’m not sure tho

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You are designing a rectangular garden. the garden will be enclosed by fencing on three sides and by a house on the fourth side.

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Suppose the dimensions of the rectangle is x by y and let the side enclosed by a house be one of the sides measuring x, then the sides that is to be enclosed are two sides measuring y and one side measuring x.

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Substituting for y into the equation for the length of fencing needed, we have

$P=x+2\left( \frac{288}{x} \right)=x+ \frac{576}{x}$

For the amount of fencing to be minimum, then

$\frac{dP}{dx} =0 \\ \\ \Rightarrow1- \frac{576}{x^2} =0 \\ \\ \Rightarrow \frac{576}{x^2} =1 \\ \\ \Rightarrow x^2=576 \\ \\ \Rightarrow x=\sqrt{576}=24$

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