Primo car rental agency charges ​$30 per day plus ​$0.25 per mile. Ultimo car rental agency charges ​$20 per day plus ​$0.80 per mile. Find the daily mileage for which the Ultimo charge is three times the Primo charge. Help PLEASE!!

Find the difference (8ab+a+2) - (3ab+6)

Factor the expression using gcf 9b+45

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?