Me with question no.1 and 2. chapter ; circles

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

What kind of bond pays interest which is exempt from tax?

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.