Question

(5+10p) +13 a.28p b.15p+13 c.23p+5 d.10p+18

Answer 1

Now, here, we need to combine like terms.

5 and 13 are like terms.

5+13 = 18

Final answer:  10p + 18

Answer 2

5+10p+13 <--remove the parentheses  
And now just add like terms
(10p)+(5+13)
10p+18 <---answer