If 12x - 3 = 17 + 7x, find the value of x.

4

Step-by-step explanation:

Given that:

12x - 3 = 17 + 7x

Collect like terms

12x - 7x = 17 + 3

5x = 20

Divide both sides by 5

5x / 5 = 20 / 5

x = 4

Hence, x = 4

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)