The surfaces intersect in a space curve c. determine the projection of c onto the xy-plane.
the paraboloids x^2+y^2+ z=4 and x^2 +3y^2=z

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?

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Me. i can't figure out this question. give an explanation too. .