Victor borrowed 21.50 from his mother to go to the theater. a week later, he paid her 21.50 back. how much did he still owe her

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.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

What is the measure of one interior angle of a pentagon