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Nana76 [90]
2 years ago
12

A couple wants to install a square mirror on their bathroom wall. The area of the square mirror is 720 square inches. To the nea

rest hundredth of an inch, what length of wood trim is needed to go around the entire mirror?PLZ ANSWER I NEED THIS IN LESS THAN 10 MINUTES
Mathematics
1 answer:
34kurt2 years ago
6 0

Answer:

26.83inches

Step-by-step explanation:

Area of the square mirror is expressed as A = L²

L is the side length of the square mirror

Given

Area = 720in²

Get the length

720 = L²

L = √720

L = 26.83

Hence the length of wood trim needed to go around the entire mirror is 26.83inches

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Answer:

Difference of squares:

y^4−25

16x^2−81

Not difference of squares:

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p^8−q^5

Step-by-step explanation:

y^4−25

(y²)² - 5²

16x^2−81

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20m^2n^2−121

20 is not a perfect square

p^8−q^5

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What shape is this cross-section?
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 years ago
Suppose that X is a random variable with mean 30 and standard deviation 4. Also suppose that Y is a random variable with mean 50
Vladimir79 [104]

Answer:

a) Var[z] = 1600

    D[z] = 40

b) Var[z] = 2304

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c) Var[z] = 80

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    D[z] = 8.94

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Step-by-step explanation:

In general

V([x+y] = V[x] + V[y] +2Cov[xy]

how in this problem Cov[XY] = 0, then

V[x+y] = V[x] + V[y]

Also we must use this properti of the variance  

V[ax+b] = a^{2}V[x]

and remember that

standard desviation = \sqrt{Var[x]}

a) z = 35-10x

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   D[z] = \sqrt{80} = 8.94

e) z = -2x + 2y

   Var[z] = 4Var[x] + 4Var[y] = 4*16 + 4*64 = 320

  D[z] = \sqrt{320} = 17.88

   

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C. 1 4 2

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