Problem involving rates and time conversion A copy machine makes 24 copies per minute. How many copies does it make in 3 minutes and 45 seconds?

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?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b

Luisa sells stuffed animals. she sells her stuffed elephant for $34.90, and the sales tax is 6% of the sale price. about how much is the sales tax on the elephant?