The equation of a cricle is

h being the x coordinate of the given point and k being the y coordinate of the given point (r also being the radius).
Now we have to plug the points into the equation

now just simplify the the equation
50% of $12,000 would be $6,000 his parents are paying for tuition. $6,000 divided by 12 months (1 year) would be $500 a month to equal $6,000 for 1 year of tuition.
Isolating the variable terms and dividing by 4, we have
Taking the square root, we have 
Answer:
True
Step-by-step explanation:
We have two salaries:
My salary is A
Your salary is B
If I earn 60% more than you
This means that

You must earn 37.5% less than me
The ratio between your salary and mine is:

Your salary is 62.5% of mine. So you earn 100-62.5 = 37.5%. So this is true.