Triangle PQR has vertices P(-3, -5),Q(2, -5) and R(1, -7). Prove that triangle PQR is right angled. (Hint: Find the gradients.)

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.!