A survey of 120 teachers determined the following: 70 had high blood pressure

40 had heart trouble

20 had both high blood pressure and heart trouble

What percent of the teachers surveyed had neither high blood pressure nor heart trouble?
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Which expression is equivalent to sq-80

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?