Muhammad is purchasing an air purifier for $143.95, including tax. he gives the sales clerk 1 fifty-dollar bill, 3 twenty-dollar bills, and 4 ten-dollar bills. how much should he receive in change?

What is the rotational symmetry of a wheel

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?