Question

What's 3z - 4 and 2z + 5

Answer 1

3z-4+2z+5
5z+1
 Hope this helped

Answer 2

Your just combining like terms here! 

By adding the you can just start by combining them with a plus sign. Like so:
3z - 4 + 2z + 5

Now you can combine terms with a z. So 3z and 2z which is 5z. So you can write this:
5z - 4 + 5

Now you have to combine the plain old numbers (but remember to take a look at the sign - or +) So -4 and + 5 which is +1 So this is your answer:
5z + 1

Hope that helps! Feel free to ask me if you have any questions! ^-^

- mathwizzard3