Determine a parametric representation for the given equation. Answers may vary.x2 + y2 = 81

A. x = 81 cos t, y = 81 sin t
B. x = cos t, y = sin t
C. x = 9 sin t, y = cos t
D. x = 9 cos t, y = 9 sin t


Answer: D

Mathematics

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Solve. Two cars leave an intersection. One car travels north, and the other travels east. When the car traveling north has gone 9 miles, the distance between the cars is 3 miles more than the distance traveled by the car heading east. How far has the eastbound car traveled?

A. 9 miles B. 18 miles C. 15 miles D. 12 miles

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Simplify the expression. Assume all variables represent positive real numbers.

A. 4x
B. x 
C.
D.

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Let A = and B = .

(a) Compute
(b) Compute
(c) Compute
(d) Compute
(e) Compute

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Simplify completely.

A.
B. - 
C.
D.

Mathematics