Aplumber charges $55 for a service call plus $35 per hour. if the plumber’s bill was $160, how many hours was he there?

49xy +34y - 72z. determine the degree of the polynomial

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?