How do you solve these ? i really need i have a test coming up so anyone i can't sleep because im scared i'll do bad on the test

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year. how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42