A scientist was in a submarine below sea level, studying ocean life. Over the next ten minutes, she went up 22.1 feet. How many feet had she been below
sea level, if she was 2.5 feet below sea level after she went up?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?