6 times the dierence of d and 5

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?

If a is a nonzero real number then the reciprocal of a is

Find the greatest common factor of the followig monomials 46g^2h and 34g^6h^6