Respuesta :

5m+15 2m+16
7m+31

9x+18 20+4x
13x+38
kritika3375

Step-by-step explanation:

For nø. 7

5(m + 3) + 2(m + 8)

= 5m + 15 + 2m + 16

= 7m + 31

For nø 8

9(x + 2) + 4(5 + x)

= 9x + 18 + 20 + 4x

= 13x + 38

Hope it will help :)

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