13 26
55
-28 and 15
23
1 x 39 3 x 13 That's basically it (as for whole numbers, decimals are another question)
A coefficient is a number that multiplies a variable.
0
13, 26, 39, 52, 65
-35
13
4 and 9
-113
55
-57
-28 and 15
55
23
1 and 26 multiply to 26.