1. What is the value of x in the equation 2x + 4 = 12?
2. If f(x) = 3x + 2, what is the value of f(4)?
3. A store offers a 20% discount on an item priced at $80. What is the final price after the discount?
4. If a rectangle has a length of 6 units and a width of 3 units, what is its area?
5. Solve for y: 5y - 3 = 22