Question

Can you please HELP ME!! I have done question a but i need help on question b. For some people it may be easy but...

Answer 1

Step-by-step explanation:

a) 8x + 5x = 13x

b) 9f + 10f - 12f = 7f

hope it helps...

Answer 2

Answer:

1) 13x

2) 7f

Step-by-step explanation:

$1)8x + 5x \\ combine \: like \: terms \\ = 13x \\ \\ 2)9f + 10f - 12f \\ add \: 9f \: and \: 10f \: together = 19f \\ substract \: 19f \: from \: 12f \\ = 7f$