Do you have any idea on how this is solved? When (h, k) both equal 0; you get a special formula. x^2 + y^2 = r^2 --- x^2 + y^2 = 25
And you can kinda look at the graph and guess which one it'll be.
Take a look at the graph here: http://prntscr.com/bj7ixd
If they are congruent, C is 60
3 hours = 180 minutes.
180 / 30 = 6
22 * 6 = 132
Koby can work about 132 maths problems in 3 hours.
