While shopping for clothes, Curtis spent $78 less than 3 times what Daniel spent. Curtis spent $21. Write and solve an equation to find how much Daniel spent. Let x represent how much Daniel spent.

The formula for the lateral area of a right cone is la = rs, where r is the radius of the base and s is the slant height of the cone. which are equivalent equations?

Explain why the factor 1.5 is broke. into two numbers in the model.

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?