Step-by-step explanation:
The coefficent of the x variable is b.
The formula for the period is

Here, b is 6 so we have

So the period is pi/3, or 60 degrees
I believe the numbers are 63 and 65.
The bottom one
That should be correct!!!
1/3 is 0.3333333 and you round it by the 3rd three, so it looks like 0.334