If student’s spent an average of $5.50 to buy materials for the science olympiad. if they each build 3 mousetrap cars, what was their unit cost per car?

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?