I need help with my homework question I just need the answer for to see if my answer is correct

EXPLANATION
y= 4.5^x
x y observed y predicted residual
-1 0 y= 4.5^(-1) = 0.222 0.222
0 1.2 y= 4.5^(0) = 1 0.2
1 4.4 y= 4.5^(1) = 4.5 0.1
2 20.4 y= 4.5^(2) = 20.25 -0.15