Mary spent a total of $321.04 for a party. She spent $200.84 on food, plus an additional $30.05 for each hour of the party. How long was the party?

Plz which expression is equivalent to the expression below?

What is an alternate exterior angle

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *