Find the exact value of the sum.sin 105° + sin 15°
A. 
B. 
C. - 
D. 
Answer: B
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Translate the problem situation to a system of equations. Do not solve.Two angles are supplementary. One angle is 27 more than three times the other angle. Find the measures of the angles.
A. x + y = 90; x = 27 - 3y B. x + y = 180; x = 3y - 27 C. x + y = 90; x = 3y + 27 D. x + y = 180; x = 3y + 27
Express the repeating decimal as a fraction in lowest terms.0.
A. 
B. 
C. 
D. 
Factor completely. If the polynomial cannot be factored, write "prime."98x4 - 50y2
A. (14x2 + 10y)(7x2 - 5y) B. 2(7x2 + 5y)(7x2 - 5y) C. 2(7x2 - 5y)2 D. 2(7x2 + 5y)2
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