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x 3 6 9 15 21

f(x) 7.79 9.426 11.405 16.699 24.448
If the function is linear or exponential, write a formula for it below. If the function is neither, enter NONE.

1 answer

since x grows by 3 each step, f(x) is linear if y does as well. The differences in y are
1.636, 1.979, ...
clearly not linear.

If f(x) is exponential, then the y terms have a constant ratio. Those are

1.21, 1.21, 1.464, 1.464
so, not exponential either
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