i dont understand these problemss.....please help me on them i got a summer packet and i dont understand almost none of the problemsss

anyway here are the problems

if the area of a circle is 64pi, then what is the circumfrence?

$\displaystyle \pi r^2=64\pi$ ,

calculate r , then put it into $\displaystyle S=2\pi r $

if the minute hand of a clock moves 45 degrees, how many minutes of time have passed?

45/360x60=...
a triangle of height 5 and base 4 has an area exactly 1/3 that of a rectangle with height 5 . what is the width of the rectangle?

1/2(5)(4)=1/3(5w) , calculate w where w is width .
here are some other problems i dont understand..

it says : determine a table of values for the domain of integers within

-6< x< 6

then it says :5x+3y=26

y=(26-5x) / 3 , so within the domain of -6<x<6 , what would the y's be? Then you will need to substitute one by one , ie -6 , -5 , -4 , ... , 6
and it has another problem

3x-3y=27

Same method .