What is

6/1 divided by 3/4

if i put it in the wrong way.. then sorry

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Solving algebraic equations 2m+3=11

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?