Express 13 pi/6 as a function of an angle in quadrant i

For this case, the first thing you should do is to know the following transformation:
 pi radians = 180 degrees
 Applying the transformation we have:
 (13pi / 6) * (180 / pi) = 390 degrees
 Then, in quadrant 1 we have:
 390 - 360 = 30 degrees
 
 13 pi / 6 as a function of an angle in quadrant i is:
 30 degrees

y=2x+20; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20

Step-by-step explanation:

Vlad spent 20 minutes on his history homework and then completely solved x math problems that each took 2 minutes to complete

Let x be the number of math problems

Initial time spent = 20 minutes

Equation is y=mx+b

each problem took 2 minutes to complete.. so m=2

y=2x+20; x is any integer greater than or equal to 0, and y is an integer greater than or equal to 20