#### helpmepls12

##### New member

- Joined
- May 19, 2017

- Messages
- 1

a) Form an algebraic expression for c(s(t)), the cost of operating the boat as a function of time. (expansion is not needed) (2A)

b) What does c(s(t)) mean in context of this problem? (2C)

c) Determine the cost per km, 5 hours into a trip under the above conditions.

for a), I got c(s(t))= (((0.01)(8+t+0.2t^2))-0.7)^2 +0.5

b) I'm guessing that it means that its the cost of operating the boat per hour?

c) Fo i just plug in 5 for the composite function i created?

pls help