Question

Which best describes the function notation f(3)=15

A) the output is 3, input is 15
B) output 15 ,input 3
C) output f(x), input 3
D) output f(15), input 3

Answer 1

The function is such that there is an independent variable and dependent variable. Usually, these are represented by x and y. The input is the independent variable, x and the output is the dependent variable, y.
The input to the function, in this case, is 3 and the output is 15. Hence, the answer to this item is letter B.