The answer is 623/800 and that is in simplest form.
.50(150)+30=$105
8(32)+12 = $268
The first one shown, 400/2, is showing the point on the graph where she walks 400 ft in 2 minutes. In order to find the next proportion, you just have to look two minutes over which in this case is 800 ft for 4 minutes... written 800 over 4.
It would be a straight line
