Find the sum of the first n terms of the following arithmetic sequence.a1 = 84, d = -85; n = 10
A. -3405
B. 3405
C. 4665
D. -2985
Answer: D
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Find the area of the triangle. If necessary, round the answer to two decimal places.A = 23°, b = 9, 
A. 3.53 B. 3.51 C. 3.50 D. 3.52
Solve the problem.Suppose f(x) = 33.1 + 1.2log (x + 1) models salinity of ocean water to depths of 
at a certain latitude. x is the depth in meters and f(x) is in grams of salt per kilogram of seawater. Approximate the depth (to the nearest tenth of a meter) where the salinity equals 35.
A. -0.9 m B. 39.3 m C. -1.0 m D. 37.3 m
Graph the solution set of the system.y ? - x2 - 6x - 4y ? x2 + 6x + 4
A. 
B. 
C. 
D. 
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083