Any help? Step by step please

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Find the nonpermissible replacement for binthis expression. b2/5b +5

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.!