Find the focus and directrix of the parabola with the given equation.y2 = 28x
A. Focus: (7, 0), directrix: x = -7
B. Focus: (0, 7), directrix: y = -7
C. Focus: (-7, 0), directrix: x = 7
D. Focus: (0, -7), directrix: y = 7
Answer: A
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Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = (-3 - 3t)i + j + 5tk, 0 ? t ? 1; ?(x, y, z) = x + z2
A. 
B. 
C. 
D. 
Estimate the answer from the table or graph.A retail store has items such that they fall under the categories of clothes, housewares, jewelry, and other. The percentage floor space allocated for displaying each category of items is shown in the pie chart. If the floor space allocated to clothes is 22,000 ft2, what is the floor space allocated to jewelry?
A. 66,000 ft2 B. 11,000 ft2 C. 44,000 ft2 D. 5500 ft2
Solve the inequality. Write the solution set in interval notation.x2 - 2x - 15 < 0
A. (-?, -3) ? (5, ?) B. (-?, -3) C. (5, ?) D. (-3, 5)
Find an equivalent expression by factoring.3x - 9y
A. 3(x - 9y) B. 3(x - 3y) C. 3(1 - 3y) D. -6xy