Using distributive property!! need help asap

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.

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.

Gabrielle's age is three times mikhail's age. the sum of their ages is 40 . what is mikhail's age? __ years old