If f(x) has a leading term of 3x^4 and zeros at x=2, x=-2, and x= -5, choose all possibly true statements: 3-2 square root of 10 is a zero of f(x) The constant term is 4 x-5 is a factor of f(x) x^2- 4 is a factor of f(x) the sign of f(x) changes twice

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?