The answer that I would choose would be C.
Step-by-step explanation:
2x²+2xy+yx+y²+2x²+2xy-yx+y²
2x²+2x²+2xy+2xy+yx-yx+y²+y²
2x²+2x²+2xy+2xy
4x²+4xy
For company a it would be at the 8th hour and they would be 210 and for company b it would be at the 7th hour