For 30 points please help me with these 3 math questions.

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.

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

Describe a situation that you could represent with the inequality x< 17