Is a d a passing grade in math a good grade to earn a credit?

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

Carlos by 24 mi and ran 6 miles what is the ratio of the distance carlos ran to the distance he biked

Louis wants to give \$15 to kids who need school supplies. he also wants to buy a pair of shoes for \$39. how much money will he have to save for both?