3(20 + 4) =
Help me pleases

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

What point is the projection of q on a) r b) s c) t