If tanA = cotB, prove that A+B =90°​

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?

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?