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B. 4.7

Step-by-step explanation:

To solve this problem all you have to do is to divide 40.514 by 8.62. This will give you the second factor that multiplies 8.62 to make 40.515.

40.514 / 8.62 = 4.7

You can check to make sure.

Therefore the final answer is 4.7, which corresponds to answer choice B.

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

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