By what percent will the product of two numbers decrease if one of them is decreased by 20% and the other is decreased by 50%?

(x - .20)(x - .50)

= (.20)(.50)

= 0.1

x =

x = .32

the product of two numbers decrease by 32%

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)

the solution is the point

step-by-step explanation:

we have

> equation a

> equation b

adds equation a and equation b

substitute the value of x in equation b to find the value of y

the solution is the point