Given f(x) = x - 7 and g(x) = x2.
find g(f(-1))
9(-1)) = 1

64

Step-by-step explanation:

f(-1)=-1-7=-8

g(f(-1))=(-8)^2=(-8)(-8)=64

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x