Factor this expression completely.
-21x + 28
7 (3x - 4)
-7(3x – 4)
- 7 (3x + 4)
- (21x - 4)

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

The length and width of a rectangle are consecutive even integers the area of the rectangle is 120 squares units what are the length and width of the rectangle

On saturday a souvenir shop had 125 customers.sixty four percent of the costumers paid with a credit card. how many costumers paid with cash?