Question

Which solution for z makes the equation true?? 10+10+z=40=10 (pls explain why. Thanks)

Answer 1

z = 10

Explanation:

10 + 10 + z = 40 - 10

10 + 10 + z = 30

10 + 10 + 10 = 30

since 40 - 10 = 30, then Z has to equal 10 because 10 + 10 + z needs to be 30

Answer 2

z=30

Explanation:

40-10=30

10+10+?=30

30-10-10=10

I'm sorry cuz I don't know how to explain it