55
-3 and -13
399
13, 26, 39, 52, 65
1 x 39 3 x 13 That's basically it (as for whole numbers, decimals are another question)
-39 minus -26 is -13
-39
39^16 = 28,644,003,124,274,380,508,351,361
2.4375
It is 39^-1.
13
4 - (-39) = 4 + 39 = 43
Their product.
39 - - 26 = 65