9x + 16 = 4x − 19
what is x?

What is the perimeter of square abcd? units units 28 units 37 units

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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?