Choose all that represent an exponential function.
a. x | -3 | -2 | -1 | 0 | 1 | 2 | 3
y | 14 | 10 | 6 | 2 | -2 | -6 | -10
b. x | -3 | -2 | -1 | 0 | 1 | 2 | 3
y | 1/2 | 1 | 2 | 4 | 8 | 16 | 32
c. x | -3 | -2 | -1 | 0 | 1 | 2 | 3
y | -14 | -9 | -4 | 1 | 6 | 11 | 16
d. x | -3 | -2 | -1 | 0 | 1 | 2 | 3
y | 4 | 8 | 16 | 32 | 64 | 128 | 256
I am sorry they are not lined up! I tried my best and I believe the answers are C and D. Can someone check for me?