Need help with expressions/terms

Question

how do you combine terms? If possible can someone please tell me how to combine these? 

 

12f - 3f

7.5g + 3.5g

180h + 35j

3/4k + 1/4k

7m + m

5n +n

Answer 1

You can combine terms if they have the same variables and powers

 

12f - 3f = (12-3)f = 9f

7.5g + 3.5g = (7.5+3.5)g = 11g

180h + 35j   h and j are different variables so these terms cannot be combined

(3/4)k + (1/4)k = (4/4)k = k

7m + m = (7+1)m = 8m

5n + n = (5+1)n = 6n 

 

You don't have to include the middle step where I used the distributive law to factor out the variable, I just wanted to include that extra step so you could see what's going on.