4 out of 5 customers ride their bike on Saturday there were eighteen customers who came without riding their bikes how many roads are bikes

The parabola opens: y=√x-4 (principal square root) up down right left

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?

Mila's dog weighs 4 pounds more than 8 times the weight of keiko's dog. which expression could be used to fine te weight of mila's dog?