What is 12 1/2 x 4 2/3

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

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?

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4