Please help! 50 points!
Roland must purchase plywood and two-by-fours for a construction project. Each sheet of plywood costs $12 and each two-by-four costs $2.50. Roland can spend at most $100, and he must purchase at least 4 sheets of plywood.
Let x represent the number of sheets of plywood purchased. Let y represent the number of two-by-fours purchased.
Which inequalities are among the constraints for this situation?
Select each correct answer.
y ≥ 4
2.5x + 12y ≤ 100
x ≥ 4
y > 0
x + y ≥ 100
12x + 2.5y ≤ 100