The instruction is right there ! "COMBINE THE LIKE TERMS".
That means ==> add up all the 'n' terms and make a single 'n' term, then ==> add up all the plain numbers to make a single plain number.
Positive correlation! hope this helps :)
Answer:24
Step-by-step explanation: the pattern is add 5 minus 2 (13+5=18, 18-2=16) so 19+5=24
