Students are to march in a parade. there will be one first grader, two second graders, three third graders, and so on, through the twelfth grade. how many students will march in the parade?

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.!