Question 26581
the gradient is -10 yes, so we have an equation of the form y=mx+c. So we get d=-10t+c.


What is c? Well to find it, we need to know a set of (t,d), which we do...at t=0, d=200 (thousand).


so, 200 = -10(0) + c

--> c = 200


so equation is d = -10t + 200


As t increases, so the value of d falls from a maximum value of 200.


Jon