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When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets,x, and the number of student tickets,y. find the solution and explain what it means. i'll you if you me

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.