72 - 39 + 7 - 2 = 38
2 + 3 - 72 = -67
12-3(2+15) = -39
A minus and a minus makes a plus A plus and a plus makes a plus A minus and a plus or plus and a minus makes a minus 7 - -2 is a minus and a minus Therefore the answer is 7 + 2 = 9
2
(13x + 39)(x + 2) * * * * * Don't you think it might, instead, be (13x - 39)(x - 2)? Multiply it out, and see!
4
Answer = 2 - (-3) = 2 + 3 = 5 minus minus means plus.
2 minus 2/5 plus 1/2 minus 4 = -1.9
Minus 8 plus 6 equals -2.
2 − 39/8 = -27/8
17
A plus times a plus is still a plus. Below is the way I remembered it: If there is not a minus sign, it is plus (positive). If there is 1 minus sign, it is minus (negative). If there are 2 minus signs, it is plus (positive).