C. 402
323.24 rounded = 323
79.13 rounded = 79
323 + 79 = 402
The line of the graph would be vertical and to the left of 4 would be shaded.
well there is 7x4, 14x2, and 28x1 of course.
There is still an negative you have to change the subtraction sign to an addition sign ALONG with the negative number