Answer a) 2mn.
Answer b) -5tz
Step-by-step explanation:
a) 3mn+(-5mn)+8mn+(-4mn)
= (3-5+8-4)mn
=2mn
b) t-8tz+3tz-z+z-t
=t-t-8tz+3tz-z+z
=(1-1)t+(-8+3)tz+(-1+1)z
=0-5tz+0
=-5tz
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Verified answer
Answer a) 2mn.
Answer b) -5tz
Step-by-step explanation:
a) 3mn+(-5mn)+8mn+(-4mn)
= (3-5+8-4)mn
=2mn
b) t-8tz+3tz-z+z-t
=t-t-8tz+3tz-z+z
=(1-1)t+(-8+3)tz+(-1+1)z
=0-5tz+0
=-5tz