Answer: +42
Step-by-step explanation: In this problem we are going to evaluate cd knowing that c = 7 and d = 6.
So the first thing we want to do is substitute
these numbers into our problem.
Since c = 7, we are going to replace this c with a 7 and as we do that, we are going to put that 7 in parentheses.
Make sure to get into the habit of putting numbers in parentheses when substituting them in for variables.
Now we will replace the d with the 6.
So we now have (7)(6) which simplifies to +42.