Respuesta :

Answer:

C

Step-by-step explanation:

add the two x^2 parts    =  10 x^2

 so answer is B or C

  add the constants   7 + 6 = 13     so answer C

Answer:

C. 10x²-x+13

Step-by-step explanation:

1. Add the numbers

x^2 - x + 7 + 9x^2 + 6

x^2 - x + 13 + 9x^2

2. Combine like terms

x^2 - x + 13 + 9x^2

10x^2 - x + 13