Whats the answer to this

Company 1:
Company 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?

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

What is the t intercept of the line given by the equation below y= -10x + 14