Question

Which value goes in the empty cell?

Answer 1

[See Below]

Explanation:

If you replace the x with -1 and evaluate the function you get -5.

Answer 2

-5 because 5x means you are multiply 5 by whatever is in the x column. If you multiply 5 and -1, you will get -5 because multiplying a positive and a negative gives you a negative answer.