Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 87 watches
B. 20 watches
C. 43 watches
D. 50 watches
Answer: D
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Identify the type of curve that each equation represents by evaluating B2 - 4AC. 30x2 + 23xy + 8y2 - 100y = 0
A. Parabola B. Ellipse C. Hyperbola
Write each inequality in interval notation and graph the interval on a number line.x > 5
A. [5, ?)
B. (-?, 5)
C. (5, ?)
D. (-?, 5]
Find the distance d(A, B) between the points A and B.A = (1, 5); B = (-3, -2)
A. 
B. 3
C. 28
D. 
From the graph of the parabola, determine whether the parabola opens upward or downward, and find the vertex, axis of symmetry, and range of the function. Find the maximum or minimum value of the function and the intervals on which the function is increasing or decreasing.
A. Up, (2, -9), x = -9, [-9, ?), min -9, dec (-?, 2], inc [2, ?) B. Up, (2, -9), x = 2, [-9, ?), min -9, dec (-?, 2], inc [2, ?) C. Up, (2, -9), x = 2, [-4, 8], min -4, dec (-?, 2], inc [2, ?) D. Up, (2, -9), x = 2, [-9, ?), min -4, dec (-?, 2), inc (2, ?)