Elvira has 2.10 in nickels and dimes. if she has 30 coins altogether, how many dimes does she have

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 of the following is the shape of a cross section of the figure shown below

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41