In an effort to save the environment, stacey makes a classroom presentation about how many gallons of water a dripping faucet can waste. if 15 gallons are wasted in three days, and 30 gallons are wasted in six days, what is the rate of change of gallons wasted per day?

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?