Which function represents the same relationship?

Step-by-step explanation:

Notice that when x = 0, f(x) = 18.  Therefore we have already eliminated choices (a) and (c) and need to pick one from (b) and (d).

Look at (b):  f(x) = 18(6/5)^x.   If x = 1, f(x) = f(1) = 18(6/5)^1 = 21.6 or 21 6/10 or 21 3/5.    Does this agree with the table?  Yes.  So (b) is the correct choice.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.