Solve.8x2 + 7x = -2
A. 
B. 
C. 
D. 
Answer: D
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Solve the compound inequality and graph the solution set on a number line. Except for the empty set, express the solution set in interval notation.-4x + 1 ? 9 or 3x + 3 ? -9
A. (-?, ?)
B. [-4, -2]
C. [-2,?)
D. [-4, ?)
Find the sum Sn of the first n terms of the geometric sequence. 3, 9, 27, 81, 243, . . . ; n = 9
A. 29,503 B. 29,560 C. 29,523 D. 29,525
Solve the problem.During a fermentation experiment, the population P (in millions per mL) of bacteria Lactobacillus fermentum after t hours in a wheat medium satisfied the differential equation 
= 0.517P
.Find P(1) = 2 using the Runge-Kutta method with a step size of 0.2 on 
A. -3.40086 B. 3.397296 C. -3.397296 D. 3.40086
Express the function as a trigonometric function of x.sin 4x
A. 1 - 8 sin2x cos2x B. 4 sin x cos3x - 4 sin3x cos x C. cos3x - 3 sin2x cos x D. 3 sin x - 4 sin3x