2(x+5)=3x+13y-4=6-2y3(n+2)=9(6-n) Explain step by step

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.

Equation for the calculation double 2 and then add 5

Tom drove 206 miles in 3.9 hours. estimate his average speed.