by By a Visitor

I say the answer is 15, my son says the answer is 18. We have been arguing over this for 20 minutes. I told him it was a trick question that they were just looking for the expression not the solution.

So, when we evaluate 3x + 3, both terms must be included in the calculation. This is shown below:

Substitute z with

3(5) + 3

Now, we just need to perform some simple calculations and we will arrive at the answer 18.

3(5) + 3=15 +3 =18

This site has a animated math video on Evaluating Expression that may be of interest to both of you (scroll down the page to see the video).

The link is given below: