× means multiply (use * online)
so f(x) = 5(1.24)x
so what?
And did you really mean 5*1.24^x
??
what does cm have to do with it?
This is an example of why some questions go unanswered. The posting is so garbled as to be meaningless.
The function f(x)=5(1.24)× in cm
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