Respuesta :

pcai26

Answer:

2018, 2004

Step-by-step 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

brandonpineda807

Answer:

2018, and 2004.

Step-by-step explanation:

do the math "using Your heads".