81
Sum = 79*(79+1)/2 = 79*80/2 = 3160
79 + 79 = 158 / 2 = 79.
79, -79
1,042
The answer is 169.78. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.
79 + 79 = 158
a + 79
9h + 2 = -79 9h = -81 h = -81/9 h = -9
9h + 2 < - 79 9h < - 81 h < - 9
42 + 79 = 121 (40+70) + (2+9) = = 110 + 11 = 121
79 + 79 = 158
79