To find g(21), we want to plug t=21 in to the given equation:
(t-6)/3
(21-6)/3
15/3
g(21) = 5
Plug in 21 for t, as g(t) = g(21)
g(21) = ((21) - 6)/3
Simplify.
g(21) = 15/3
Divide.
5 is your answer
hope this helps
