A construction crew can clear ½ton of dirt in 90 minutes. How much dirt can they clear in 4 hours?

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

Arecipe uses 2 cups of sugar to make 32 brownies. how many cups of sugar are needed to make 72 brownies?

Using elimination, what is -4x+2y=-12 4x+8y=-24