Find the center, foci, and vertices of the ellipse.36x2 + 9y2 = 324
A. center at (0, 0)
foci at (- 3
, 0) and (3
, 0)
vertices at (-6, 0), (6, 0)
B. center at (0, 0)
foci at (0, 6) and (3, 0)
vertices at (0, 36) and (9, 0)
C. center at (0, 0)
foci at (0, - 3
) and (0, 3
)
vertices at (0, -6), (0, 6)
D. center at (0, 0)
foci at (0, -6) and (0, 6)
vertices at (0, -36), (0, 36)
Answer: C
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Solve.The function N(t) = 
, t ? 8gives the body concentration N(t), in parts per million, of a certain dosage of medication after time t, in hours.Graph the function on the interval [8, ?) and complete the following:N(t) ? 
as t ? ?.
A. 
N(t) ? 0.1 as t ? ?.
B. 
N(t) ? 1 as t ? ?.
C. 
N(t) ? 0 as t ? ?.
D. 
N(t) ? 0.086 as t ? ?.
If A denotes the area of the sector of a circle of radius r formed by the central angle ?, find the missing quantity. If necessary, round the answer to two decimal places.r = 9 feet, A = 36 square feet, ? = ?
A. 1458 radians B. 0.44 radians C. 2916 radians D. 0.89 radians
Find the geometric mean between 49 and 121.
(a) ±7 (b) ±77 (c) ±11 (d) ±12
Find the area of triangle ABC with the given parts. Round to the nearest tenth when necessary.a = 150 mb = 164 mc = 172 m
A. 16,889 m2 B. 11,259 m2 C. 722 m2 D. 14,074 m2