Answer:
4.5
Step-by-step explanation:
Without calculation, you can notice 60 deg= 2*30 deg
The answer options relevant to this is 4.5
other numbers are too much for this triangle
42 - 2x is the answer because x is the variable standing in for the number that will be multiplied by 2 (2x means 2 times something) and decreased by just means minus. if you haven't gotten to doing 2x then do 42 - 2*x
