Question

I would really appreciate it if someone could help me out with this problem

Answer 1

2018, and 2004.

Explanation:

do the math "using Your heads".

Answer 2

2018, 2004

Explanation:

substitute C(t) for 1274 because it's the cost

1274=6(t-11)^2+980

6(t-11)^2=294

(t-11)^2=49

x-11=7 x-11=-7

x=18, x=4