Answer:
9(t + 3) = 81
Step-by-step explanation:
Since everyone in the 9-people group must pay the entrance ticket (t) and skate rental fee ($3), we need the expression 9(t + 3) = 81. To solve for t, divide both sides by 9 to get t + 3 = 9, so t = 6. The cost of each entrance ticket is $6.
