Each model car in a set costs $4. there are 30 different model cars in the set. how much would it cost to buy all the model cars in the set?

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.!