Al drew a line that was Three-fourths of an inch long. He decided to shorten it and erased One-fourth of an inch of the line. How long was the line that remained? Express the answer in lowest terms.

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

Asix-sided number cube is rolled twice. what is the probability that the first roll is an even numbe and the second roll is a number greater than 4?