- if
A = 29° and a
= 4.6
find c.

Let g(x) = 28x 
where g(x) is a function of x (in miles) and its output is the number of calories burned over the given distance.
let h(t) = 420t 
where h(t) is a function of t iin hours) and its output is the number of calories burned over the given time. 
the list goes on.