The table below represents the function f.

chart:

x l 3 l 4 l 5 l 7 l 8 l

f (x) l 7 l 15 l 31 l 127 l 255 l

the equation that represents this function is

A. F (x) = 3^x

B. F (x) = 3x

C. F (x) = 2^x-1

D. F (x) = 2x+1

The mean of 22.3 19.7 25.4 and another number is 23.4 find the missing number

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