The equation of a line is y=-2x+12. What is the equation of a line parallel to this line?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

The sides of a parallelogram are 24cm and 16cm. the distance between the 24cm sides is 8 cm. find the distance between the 16cm sides

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?