to watch a varsity basketball game, Spectators must buy a ticket at the door. The cost of an adult ticket is $3 and the cost of a student tickets is $1.50. If the number of adult tickets old is represented by a and student tickets sold by us, which expression represents the amount of money collected at the door from the ticket sales?1) 4.50as2) 4.50(a+s)3) (3.00a)(1.50s)4) 3.00a + 1.50s