If 2/3(9x-6)-4=9x-6 l, what it's the value of 3x-2

A. -4
B. -4/5
C. -2/3
D. 4

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?