79 + 79 = 158 / 2 = 79.
Sum = 79*(79+1)/2 = 79*80/2 = 3160
81
well a=9 251
79, -79
400 dived by 2 is 200 dug
1,042
79 + 79 = 158
a + 79
79 + 79 = 158
Not sure about dived, but 2 divided by 701 = 0.002853, approx.
9h + 2 < - 79 9h < - 81 h < - 9
9h + 2 = -79 9h = -81 h = -81/9 h = -9