Find the area of the specified region.Inside the circle r = 6 cos ? + 3 sin ?
A. 
B. 9?
C. 
D. 
+ 9
Answer: C
Mathematics
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Express the number in scientific notation.4,200,000,000,000
A. 4.2 × 1012 B. 4.2 × 10-12 C. 4.2 × 10-9 D. 4.2 × 109
Mathematics
Rationalize the numerator of each fraction.
A. 
B. 
C. 
D. 
Mathematics
Write as a percent. 1.86
A. 1860% B. 286% C. 2360% D. 186%
Mathematics
Solve the problem.Use the formula d = 10 log (I/I0), where the loudness of a sound in decibels is determined by I, the number of watt/m2 produced by the soundwave, and 
watt/m2. What is the intensity in watt/m2 of a noise measured at 84 decibels? Round to the nearest tenth.
A. 2.5 × 10-3 watt/m2 B. 2.5 × 10-4 watt/m2 C. 8.4 × 10-10 watt/m2 D. 4.4 × 1015 watt/m2
Mathematics