Answer:
$16
Step-by-step explanation:
He had $16 so he had spent all of it due to the question asked.
Answer:
34+4a
Step-by-step explanation:
-2a+7-3(-9-4a)
➡ -2a+7+27+12a
➡34+10a

This is because you can at most, factor out x² and y³
12 because if you take 2 and add it to 10 you get 12