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

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!