Form the union for the following sets.
x = {0, 10, 100, 1000)
y = (100, 1000)
xu y =
00)
{0, 10)
(100, 1000)
(0, 10, 100, 1000)

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)

12m

step-by-step explanation:

square root means have of a number so have of 3 is 1.5 then multiply it by 8 and you get your answer!