Perform the indicated computations. Write the answer in scientific notation.
A. 9 x 107
B. 18 x 107
C. 18 x 109
D. 9 x 109
Answer: D
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Use the zero-exponent rule to simplify the expression.18y0
A. 18 B. 18y C. 0 D. 1
Solve the problem.For what numbers x, 0 ? x ? 2?, does sin x = -1?
A. ?
B. 
C. 
, 
D. none
Points at which the graphs of r = f(?) and r = g(?) intersect must be determined carefully. Solving f(?) = g(?) identifies some - but perhaps not all - intersection points. The reason is that the curves may pass through the same point for different values of ?. Use analytical methods and a graphing utility to find the intersection points of the given curves for 0 ? ? ? 2?.r = 6 + cos ?, r = 6 - sin ?
A. 
, 
B. 
, 
C. 
, 
D. 
, 
Solve the problem.The shadow cast by an object on a sunny day varies directly as the height of the object. If a person 56 inches tall casts a shadow 65 inches long, how tall is a tree which casts a shadow 44 feet in length?
A. 37.91 ft B. 60.5 ft C. 51.07 ft D. 82.73 ft