The answer is 4x-6. Good luck! :D
These are vertical angles, meaning they're always the same length.



Remember the rules of PEMDAS
1. First you want to evaluate the parentheses. (4-1) = 3
2. Square:
3^2 = 9
3. Multiply: 9*2 = 18
Your answer is C
When written in scientific notation, 3,900 = 3.9 x 10^3