Solve the problem.Water is falling on a surface, wetting a circular area that is expanding at a rate of 
How fast is the radius of the wetted area expanding when the radius is 
(Round your answer to four decimal places.)
A. 0.0051 mm/s
B. 0.0026 mm/s
C. 391.6516 mm/s
D. 0.0160 mm/s
Answer: B
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Use the formula A = P(1 + rt) to find the indicated quantity.A = $16,400; r = 10%; 90 days. Find P.
A. $16,810 B. $16,400 C. $16,000 D. $400.00
Solve the problem.If (1, 5) is the endpoint of a line segment, and (4, 6) is its midpoint, find the other endpoint.
A. (3, 11) B. (-5, 3) C. (7, 4) D. (7, 7)
Use the graph of the quadratic function to determine the sign of the leading coefficient, the vertex, and the equation of the axis of symmetry.
A. Negative; (-1, 3); y = 3 B. Negative; (-1, 3); x = -1 C. Positive; (1, 3); x = 1 D. Positive; (-1, 3); x = -1
Find the focus and the directrix of the parabola.(x + 2)2 = 16(y + 4)
A. Focus: (-2, 0); directrix: y = -8 B. Focus: (-2, -8); directrix: y = 0 C. Focus: (-4, 2); directrix: y = -6 D. Focus: (-2, 0); directrix: x = -8