Let sin a = 12/13 with 90º≤a≤180º and tan b = -4/3 with 270º≤b≤360º. find tan (a - b).

a) -63/65
b)56/33
c)-16/63
d)65/56

The sum of two numbers is 86, and their difference is 20. find the two numbers

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.