What math are you in because I can ask my friends for help
So
I=P⋅i⋅t=Ii⋅t=50000.04⋅6=20833.33
70.6179 and something something i think but am more than happy to answer
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.