F (x) = sqrt x-5 find f - 1

A.

f - 1 (x) = (x + 5) 2; y > 5

B.

f-1 (x) = x2 + 25; y> 25

C.

f - 1 (x) = x2 + 5; y > 5

D.

f-1 (x) = x2 + 25; y> 5

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What does k equal in 17 + k = - 7

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12/56 56/35 21/58 78/98