What does it mean when you're?

I just wanna c. hat t. b.h.. im bor. ed

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Match each inequality to the number line that represents its solution

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?