can't do this can you help please?
evaluate each expression if x=3 ,y=2 and z=5
(yz-x) and (yz-x)^3 ??

3) The average newborn length is 21 inches. An equation for height as someone grows could be: 21 inches + (2.72 inches per year)*age. How tall is this person at age 6? 10? 14? 18?
4) A tiler is placing 6 inch x 6 inch tiles (1/4 square foot) in a shower. She will need to have 6 extra tiles in case some are broken. An equation for how many tiles she will need is: 6 extra tiles + (1/4 square foot per tile)*(n) where n is the number of tiles.

Question

can't do this can you help please?
evaluate each expression if x=3 ,y=2 and z=5
(yz-x) and (yz-x)^3 ??



3) The average newborn length is 21 inches. An equation for height as someone grows could be: 21 inches + (2.72 inches per year)*age. How tall is this person at age 6? 10? 14? 18?
4) A tiler is placing 6 inch x 6 inch tiles (1/4 square foot) in a shower. She will need to have 6 extra tiles in case some are broken. An equation for how many tiles she will need is: 6 extra tiles + (1/4 square foot per tile)*(n) where n is the number of tiles.