Estimate each sum or difference 2 1/4 + 5 1/2 + 10 3/4

Bruce is getting materials for a chemistry experiment his teacher gives him a container that has 0.25 liter of liquid in it. bruce need to use 0.4 of this liquid for the experiment. how much liquid will bruce use?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300