Which expressions are equivalent to -4(3d-2)-7−4(3d−2)−7minus, 4, left parenthesis, 3, d, minus, 2, right parenthesis, minus, 7 ? Choose all answers that apply: Choose all answers that apply: (Choice A) A -12d-15−12d−15minus, 12, d, minus, 15 (Choice B) B 12d-1512d−1512, d, minus, 15 (Choice C) C None of the above

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?