Well, if someone could at least help me with part a...

Okay, update:

I figured out part A.

C(t)=1.5*e^(.06t)

I think I remember a function for the average in this kind of situation...but of course I can't remember it. Does anyone know it?

average value of f from a to b:

= 1/b-a integral from a to b of f(x)dx

And the decimal answer is 100.61. Does anyone know how to find the exact answer?

I figured out part b.

it's (1/100)*25*(e^(.06*100)-e^(.06*0)).

Now during what year was the electrical consumption closest to the average for the century? The average was 100.61...1900 was 1.5...2000 was 605...

It was 1970. And I just guessed on that one, using my calculator to help me. Hehe.

I'm not really quite sure what part d is asking...

Now here are the choices I'm given:

a) The average consumption is on the upper half of the graph.

b) The t-value for the average consumption is on the right side of the graph.

c) The t-value for the average consumption is on the left side of the graph.

d) The average consumption is on the lower half of the graph.

It's B. The t-value for the average consumption is on the right side of the graph.