Answer:
x=0
Step-by-step explanation:
You are asked what is the number to be use as the exponent of
, in order to get as answer "1".
Use the property of exponents that sates that : 
In your case
so the exponent "x"must be = 0 (zero)
I think as that is a variable so when you like add there is already a constant so it is 1
1+1+1+1= 4
x=1
Angle a is 22.62 degrees
and
angle b is 67.38 degrees