Answer:
18w
p^8
4k
5z^4
Explanation:
1. 2w+ 16w= 18w
2. when multiplying exponents just add the exponents giving you p^8
3. 7k - 3k= 4k
4. 5z also equals 5z^1 and just like problem two you will just add the exponents but you will leave the coefficient( 5 alone) giving you 5^4