1/2 * 2exp x < 5x + 2

what is x?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?