Posted by Jane on .
a 154 lb person burns 420 calories per hr riding an exercise bike at 15 mph. Need a function rule to represent the total calories burned over time.

8need a function rh grade math 
Steve,
c = 420h
as far as I can see, the weight and speed have no bearing on the calories burned.
Naturally, in the real world, they do, but since you have provided no data connecting them to the burn rate, I can't include them as variables.