28. Use the discriminant to determine all values of k that would result in the equation $x^2 - kx + 4 = 0$ having equal roots.

29. The scores of one class on the Unit 2 mathematics test are shown in the table below.

 Test Score Frequency 96 1 92 2 84 5 80 3 76 6 72 3 68 2

Find the population standard deviation of these scores, to the nearest tenth.

30. Find the sum and product of the roots of the equation $5x^2 + 11x - 3 = 0$

31. The graph of the equation $y = (\frac{1}{2})^x$ has an asymptote. On the grid below, sketch the graph of $y = (\frac{1}{2})^x$ and write the equation of this asymptote.

32 Express $5\sqrt{3x^3} - 2\sqrt{27x^3}$ in simplest radical form.

33. On the unit circle shown in the diagram below, sketch an angle, in standard position, whose degree measure is 240 and find the exact value of sin 240°.

34. Two sides of a parallelogram are 24 feet and 30 feet. The measure of the angle between these sides is 57°. Find the area of the parallelogram, to the nearest square foot.

35. Express in simplest form: $\frac{ \frac{1}{2} - \frac{4}{d}}{ \frac{1}{d} + \frac{3}{2d}}$