What is surface area of the figure below, in square inches?

What is the value of x in the diagram below?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Which function can be used to model the monthly profit for x trinkets produced? f(x) = –4(x – 50)(x – 250) f(x) = (x – 50)(x – 250) f(x) = 28(x + 50)(x + 250) f(x) = (x + 50)(x + 250)