Which expression is equivalent to the expression shown !

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

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.

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)