(zoom / zoom out if needed to see question. (: )

can someone me with this problem ? i'll seriously appreciate it, and you so so so much in
don't answer if you're ! i need actual , don't just take my points. (: you!

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.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

How can you use synthetic substitution to tell whether a given binomial is a factor of a polynomial?