47:28
Which expression represents the number of possible combinations of n items taken r at a time?
(n-nir
(n-1)!
(n-1)!!

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)

x=half

step-by-step explanation:

im with everythinglos so yeahhhhh

step-by-step explanation: