Answer:


Step-by-step explanation:
As given



As given the expression.


Solving the above


In the decimal form.
= 8.67 (Approx)


the factor for this expression is 7
90-n=3n
90=4n
22.5=n
Final answer 22.5
A linear pair is 2 angles that form 180° or a straight line. The sum of their measures is 180°