To put money into a savings account, CDs, and stocks is to___
diversify
secure assets
be risk-adverse
invest

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?

Combine like terms to make a simpler expression 3z+z