How can this be possible? what should we add to make this true?
0 + 0 + 0 + 0 + 0 =120

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)

Don't know how to find x given these segment lengths