Answer:
The correct answer is B
Step-by-step explanation:
Kinda complicated to explain, if you need me to then comment and I'll do it
-12 + 8 - (-9) = 5
Therefore the value of -12 + 8 - (-9) is 5.
Answer:

Step-by-step explanation:

Answer:
C (The lizards in aquarium A vary in length more than aquarium B.)
Answer:
b = 
Step-by-step explanation:
Given
=
+ 
Multiply through by 2ac to clear the fractions
ac = 2c + 2ab ( subtract 2c from both sides )
ac- 2c = 2ab ( divide both sides by 2a )
= b