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.

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.