Hey there!
f(x) = 13(6)x
y = 13(6)x
y = 78(3)
y = 234
Therefore, your answer: f(x) = 234
OR
f(x) = 13(6)^x
y = 13(6)^x
y = 13(6)^3
y = 13(6 * 6 * 6)
y = 13(36 * 6)
y = 13(210)
y = 13(210)
y = 2,808
Therefore, your answer: f(x) = 2,808
EITHER OF THOSE SHOULD BE YOUR ANSWER!!
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)