Hello!
First, let's write the problem.

Apply the distributive property on the left side of the equation.

Add like terms.

Let's plug that in into the original equation.

Add 4 to both sides.


Divide both sides by 5.

Our final answer would be,

You can feel free to let me know if you have any questions regarding this!
Thanks!
- TetraFish
the answer is the last one
Answer:
C
Step-by-step explanation:
2.5x10^3 I think. Exponents are subtracted. The number you're multipliying by has to be more than one.
42 and 17 millionsth.....