Question

Please help me I don’t understand I will mark as brainliest!!! Stay safe :)

Answer 1

Answer:

A) $\frac{n+54}{9} =21$

$n+54=21*9$

$n+54=189$

$n=189-54$

B) $n=135$

C) Equation and Solution:

$n+28=156\\n=156-28\\n=128$