1138 15 29 57 ___From 8: add 7 = 1515 + (7 * 2) = 15 + 14 = 2929 + (14 * 2) = 29 + 28 = 5757 + (28 * 2) = 57 + 56 = 113
They add up to 28
List numbers that multiply to make 28 and find their sums. Since negative times a negative is positive, list the negatives. -1, -28 = -29 -2, -14 = -15 -4, -7 = -11 Aha! -4 and -7 multiply to make 28 and add to -11; therefore, -4 and -7 are the two numbers.
The GCF of 15 and 28 is 1. The factors of 15 are 1, 3, 5, and 15 The factors of 28 are 1, 2, 4, 7, 14, and 28 So the GCF of 15 and 28 is 1
8-28 + 7-28= 15-28
15
15 - 1, 3, 5, 15 28 - 1, 2, 4, 7, 14, 28 The GCF is 1
4
They add up to 7/15 pus 2/15 = 9/15 or 3/5 in its simplest form
-25
2/7 + 1/4 (2*4)/(7*4) + 7/(4*7) 8/28 + 7/28 (8 + 7)/28 15/28
-41