Write the equation for the circle with center (1, 1) and radius 5.
a. (x - 1)2 + (y - 1)2 = 5
b. (x - 1)2 + (y + 1)2 = 25
c. (x - 1)2 + (y - 1)2 = 25
d. (x + 1)2 + (y - 1)2 = 25

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30