Find the exact value of each expression.

1. sin 50° cos 40° + sin 40° cos 50°
2. (tan pi/3 + tan pi/6) / (1- tan pi/3 tan pi/6)

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.!