Find the indicated series by the given operation.Show that by differentiating term by term the expansion of 
the result is the expansion for 
.
A. 
= 2
B. 
= 2x(1 - x2 + x4 - x6 + . . . )
C. 
= 2
D. 
= 2x(1 + x2 - x4 + x6 - . . .)
Answer: B
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An observer for a radar station is located at the origin of a coordinate system. For the point given, find the bearing of an airplane located at that point. Express the bearing using both methods.(0, 7)
A. 180°; S 0° W or S 0° E B. 180°; N 0° W or N 0° E C. 0°; N 0° W or N 0° E D. 0°; S 0° W or S 0° E
Find decimal notation.
A. 1.025 B. 1.0875 C. 1.075 D. 1.0625
Completely factor the expression.
?
?
A. 
B. 
C. 
D. 
E. 
Solve the problem.The level of a sound in decibels (db) is determined by the formula 
where I is the intensity of the sound in watts per square meter. What is the intensity of a noise measured at 53 db? Express the answer in scientific notation, rounded to two decimal places.
A. 2.00 × 10-7 watt/m2 B. 2.00 × 1014 watt/m2 C. 5.30 × 10-10 watt/m2 D. 2.00 × 10-6 watt/m2