Answer:
-8
Step-by-step explanation:
For the first one it is 4n^2-4
Answer: C electricity
Step-by-step explanation:
It is
Answer:
10 hours
Step-by-step explanation:
Say x is the number of hours he can rent the detector at most. Using it, we can set up this equation:
15 + 2x = 35
Subtract 15 from both sides
2x = 20
Divide by 2 on both sides
x = 10