I think it is 24...Im not sure tho
Answer:

a=8.182 and b=8
Step-by-step explanation:
Weight of the Empire State Building =
pounds.
Weight of the One World Trade Center building= 88,200,000 pounds.
=
The addition of the two:

Comparing with the form: 
a=8.182 and b=8
If you factor the trinomial using the AC method the answer would be
(x-3)(x+9)
Answer:
21
Step-by-step explanation: