Find Sn, for the arithmetic series in which
a = 5, an = 104, and n = 34.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

How do you write something in scientific notation?

Can someone tell me if this is perpendicular? !