Fill in the missing word: an unknown or changeable quantity is called a(n)

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

You need to solve a system of equations. you decide to use the elimination method. which of these is not allowed? 3x - 2y = 7 3x + 4y = 17 equation 1 equation 2