Solve for x (2x+1) (x+29)

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?

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

Which shows a reasonable estimation for 124% of 42 using the distributive property?