223 - 87 = 136
(3*4 + 7)*2 = (12+7)*2 = 19*2 = 38
1, 2, 7, 14, 19, 38, 133, 266 -1, -2, -7, -14, -19, -38, -133, -266
38/s - 7 = 12 multiply through by s 38 - 7s = 12s 38 = 19s 2 = s check 38/2 - 7 = 12 19 - 7 = 12 12 = 12 checks
2 x 7 = 14 2 x 19 = 38
14 over 38 in simplest form is 7/19
4X - 7 = 31 add 7 to each side 4X - 7 + 7 = 31 + 7 4X = 38 divide both sides integers by 4 (4/4)X = 38/4 X = 38/4 = 19/2 --------------------------reduced, check in original equation 4(19/2) - 7 = 31 76/2 - 7 = 31 38 - 7 = 31 31 = 31 -----------checks
72 - 39 + 7 - 2 = 38
The factors of 42 are 1, 2, 3, 6, 7, 14, 21 and 42. The factors of 38 are 1, 2, 19 and 38. 2 is the greatest factor which divides both 38 and 42. So, the GCF of 42 and 38 is 2.
The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 38 are 1, 2, 19, and 38. The GCF of 42 and 38 is 2.
Factors of 38: 1, 2, 19, 38. Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42. GCF (38, 42) = 2
Factors of 38: 1, 2, 19, 38Factors of 70: 1, 2, 5, 7, 10, 14, 35, 70GCF (38, 70) = 2
31+5+2=29+7+2=23+13+2=19+17+2=38