Answer: I think It's C i'm not sure tho. Sorry
Answer:

Step-by-step explanation:
40ab is 40 multiplied by a multiplied by b
Answer:
n°
Step-by-step explanation:
Your selection is correct. Once again, they are alternate angles, meaning they're equal to one another.
Answer:
-6x-12
Step-by-step explanation:
If b>a, b-a=5 so b=5+a
ab=126, using b from above
a(5+a)=126
5a+a^2=126
a^2+5a-126=0
(a+14)(a-9)=0, since a<0 the numbers are
-14 and -9