15 x 6 or the long way is 90
90 minus 75 =15 therefore 15 + 75 = 90
75 + 15 = 90
278
15 + 80/90 = 143/9 = 15.888
6 of them plus 10 = 100
The GCF of 75 and 90 is 15.
(5 x 15) + (6 x 15) = 11 x 15 = 165
22150.5
3x2-39x-90 = (3x+6)(x-15) when factored
385
480