All i know is that the equation of a straight line is y=mx+c .......where m= gradient and c= the y intercept
The formula for the radius is

so the answer would be 6 inches
I think it’s 76 because I added it that’s a way i solved it but you can also multiple it by 1 and it will give the the same answer
Answer: (2, -10)
Down and left are negative right and up are positive.