Answer: x = 6
Step-by-step explanation:
We know that the angles combined are complementary, meaning they add up to 90 degrees.
Therefore, we can make this equation:
(x + 54) + 5x = 90
Then, combine like terms.
x + 54 + 5x = 90
6x + 54 = 90
Now, subtract the 54 from that side.
6x = 90 - 54
6x = 36
Next, divide!
= 
x = 6
m + 4mn – 9m1n + nm6 + 5 is a exprsssion with four terms
Step-by-step explanation:

All you have to do is find the important info and use it and do whatever and all you have to do is take the numbers do the question and ur done :D