PLEASE HELP

Mathematics

1 answer:

igomit [66]3 years ago

7 0

width = 10 feet → C

let l represent the length then width = l - 8

perimeter = 2(length + width) = 2(l + l - 8)

given perimeter = 56 then

2(2l - 8)= 56

divide both sides by 2

2l - 8 = $\frac{56}{2}$ = 28

add 8 to both sides

2l = 28 + 8 = 36

divide both sides by 2

l = $\frac{36}{2}$ = 18

thus length = 18 feet and width = 18 - 8 = 10 feet

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How to solve this? Is the question correct? ty :)

bezimeni [28]

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The proposition is true.

Step-by-step explanation:

Now we proceed to demostrate that expression given is true by algebraic means:

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4) $\frac{x^{-2}+y^{-2}}{(x\cdot y)^{-1}}$ Commutative, associative and modulative properties/Existence of additive inverse/ $a^{b}\cdot c^{b} = (a\cdot c)^{b}$

5) $[(x\cdot y)^{-1}]^{-1}\cdot (x^{-2}+y^{-2})$ Commutative property/Definition of division

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