subtracting 9.1 - 12.9 is -3.8
ANSWER

EXPLANATION
The given equation is:

Group similar terms to obtain:

Simplify similar terms,

Divide both sides by -2.5


Answer:
i'm pretty sure it is c
Step-by-step explanation:
<h2>
Answer:</h2>

<h2>
Step-by-step explanation:</h2>
If resistors are in series, so the current
is the same in all of them. In this problem we have four resistors. So, we can get a relationship between the Equivalent resistance of series combination and the four resistors as follows:

is the total resistance
. Moreover:

Therefore:

5x+25 final answer is x=5