-4(x + 1) + 7x = 8
-4x - 4 + 7x = 8
3x - 4 = 8
3x = 8 + 4
3x = 12
x = 12/3
x = 4 <===
I’m not sure if your asking for the solution, but Hope this helps!
It would be 550 cm every 1 meter would be 100 cm so 5.5 will be 550cm
The correct answer is D) a+2b.
Hope it helps!