Answer:
A triangle has sides of lengths 9,7, and 12 is not a right triangle .
For the first one, the answer is -51
I'm sorry, but I don't know the answer for the second one. Either way, I hope this helped you.
Answer:
Step-by-step explanation:
if g(a)=19
19=3a-5
24=3a
a=8
2a=16