A boat moves 15 kilometers with the current (downstream) in the same amount of time it moves 10 kilometers against the current (upstream). If the rate of the current is 7 kilometers per hour, find the rate of the boat in still water.

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. another supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which would you choose and how much would you save with that choice? show calculator try it! if you buy 1000 ml bags, how many do you need to buy each month? type your answer in the space provided and click on the check answer button.

Icould really use some with this question.

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?