Solve for y
1/8y-2/3=5.5

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

I'm confused on this could anyone me and show me what i need to do to solve it.

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?