3n/8 - n/4 + 2 n/2 rewrite the expression by collecting like terms

Moira has a canvas that is 8 inches by 10 inches. she wants to paint a line diagonally from the top left corner to the bottom right corner. approximately how long will the diagonal line be?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor