If 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the outside of a spherical tank of diameter 20 feet?

1 gallon of paint covers area = 400 square feet

Diameter of spherical tank = 20 feet

Radius =

Surface area of sphere is =

SA= = 1256 square feet

Now,  according to the question, 400 sq feet area is covered in 1 gallon

So, 1256 square feet will be covered in =

Hence, 3.14 gallons of paint is required to paint the outside of the spherical tank.

1 is b and 2 is d

step-by-step explanation:

the square root of what number? if you add that, then someone will probably answer the question.