Look at the following sum. 1 + 1⁄2 + 1⁄4 + 1⁄8 + 1⁄16 + 1⁄32 + 1⁄64. . notice that the denominator of each fraction in the sum is twice the denominator that comes before it. if you continue adding on fractions according to this pattern, when will you reach a sum of 2?

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)

it would take 7/10 of an hour too fill the pool.

step-by-step explanation: