How do u do this problem? Thank you!

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

How is the equation of this circle written in standard form? x2 + y2 - 6x + 14y = 142 a) (x - 3)2 + (y + 7)2 = 200 b) (x+ 3)2 + (y - 7)2 = 200 (x - 6)2 + (y + 14)2 = 142 d) (x+6)2 + (y- 14)2 = 142

See attachment below and find the equivalent of tan(∠qsr)