Nine times the input minus seven is equal to the output. which of the following equations describes this function?
a) 9y - 7 = x
b) 7y - 9 = x
c) 9x - 7 = y
d) 7x - 9 = y

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?

How many ordered pairs of positive integers satisfy xy=32?

The volume of the a sphere whoes diameter is 18 cm is cubic cm . if it's diameter were reduced by half, it's volume would be of its original volume