The definition of a function is that for each input, there is only one output.
Thus, the answer to your question is A, as it is the only answer option that each input has only one output.
In answer choice B, the input -1 has outputs of both -2 and -5.
In answer choice C, the input 4 has outputs of both 3 and 0.
Finally, in answer choice D, the input -4 has outputs of both -4 and 4.
Therefore, answer A is the only function because it is the only option that follows the definition.
Hope this helps! :)
Step-by-step explanation:
Since each dot represents the number of books read in one week, to determine how many weeks long the summer reason program was, just count all the dots, and divide the result by the number of books represented by a dot.
Your answer is =<span>-14jk</span>
