T=0 corresponds to the beginning of 2000 and t is the number of years since 200 what was the projected solacell produced energy output in 2006 (in millions of kilowatt-hours)

S(t) = 0.73t^2 + 15.8t + 2.7

From 2000 to 2006, how many years went by?

This number of years is t.

Now, use that value of t into the given equation and solve for S(t).

What do you get? :)