Answer is A.
step 1 , 16 was not multiplied by 9
should be
54x - 9y = 144
What question are you asking?
Answer:
Step-by-step explanation:
Answer:
I'm not completely sure but if they want exponents for 6 * 6 * 6 then it should be 
Step-by-step explanation:

As we know, sum of interior angles of a triangle is 180°
that is ~
Hence, value of x is 9°