Which set of values makes the inequality n ≥ -5 true?

Which of the following is true for the relation f(x)=2x^2+1

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

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?