The circumference of the hub cap of a tire is 72.72 centimeters. Find the area of this hub cap. Use 3.14 for pi.

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 simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.