1 The roots of a quadratic equation are real, rational, and equal when the discriminant is

(1) –2 (3) 0 (2) 2 (4) 4

1 2 3 4

2 Chad had a garden that was in the shape of a rectangle. Its length was twice its width. He decided to make a new garden that was 2 feet longer and 2 feet wider than his first garden. If x represents the original width of the garden, which expression represents the difference between the area of his new garden and the area of the original garden?

(1) 6x + 4 (3) x^{2} + 3x + 2 (2) 2x^{2} (4) 8

3 The accompanying graph represents the value of a bond over time.

Which type of function does this graph best model?

(1) trigonometric (3) quadratic (2) logarithmic (4) exponential

4 An object that weighs 2 pounds is suspended in a liquid. When the object is depressed 3 feet from its equilibrium point, it will oscillate according to the formula x = 3 cos (8t), where t is the number of seconds after the object is released. How many seconds are in the period of oscillation?

(1) π/4 (3) 3 (2) π (4) 2π