The answer could be
D
but i’m not a 100% sure
Answer: (-3,2) im pretty sure
Answer: 0, 4
Step-by-step explanation:
Answer: The simplification is 
Step-by-step explanation:
Here we need to use the property:

We have the expression:

We can separate it in parts with the same base, then we can rewrite this as:

Using the first property we can rewrite this as:

20÷2=10 ( gallons half full)
10+5=15 ( gallons you add)
The tank has 15 gallons and is 75% full