1. which of the following is equivalent to the expression 3x? select all that apply. a. the product of 3 and x b. 3 times x c. 3 more than x d. 3 less than x 2. at the local movie theater, adult tickets cost $9 and children’s tickets cost $5. what would be the best choices for variable(s) when writing an equation for the cost of attending the movies? a. t would represent the number of tickets b. x would represent the number of adult tickets, and y would represent the number of children’s tickets c. a would represent the number of adult tickets, and c would represent the number of children’s tickets d. c would represent the cost of both tickets 3. when budgeting for a semester at a college, the cost for each credit hour is $250 and the cost for each textbook is $120. what would be the best choices for variable(s) when writing an equation for the total cost of the courses? a. c would represent the number of credit hours, and t would represent the number of textbooks b. x would represent the number of credit hours, and y would represent the number of textbooks c. c would represent the number of classes d. t would represent the total number of classes and textbooks