What is the value of
4x the power of 2 + 5x when x=1?

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

How do i put 3(x+7) in distributive property

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?