Find the distance between the two points rounding to the nearest tenth (if necessary). (-1,5) and (4, -7)

What number produces an irrational number when multiplied by -1.25

Which of the following are parts of a sphere

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?