What is the value of x and what is the measure of ? ?

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8