Find the direction angle of the vector v. Round to the nearest tenth if necessary. v = -i + 
j
A. 135°
B. 300°
C. 150°
D. 120°
Answer: D
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Determine the symmetries of the curve.r = 6 sin 4?
A. x-axis only B. y-axis only C. x-axis, y-axis, origin D. No symmetry
Solve the problem.Suppose a business can sell x gadgets for p = 250 - 0.01x dollars apiece, and it costs the business 
dollars to produce the x gadgets. Determine the production level and cost per gadget required to maximize profit.
A. 11,250 gadgets at $137.50 each B. 13,750 gadgets at $112.50 each C. 111 gadgets at $248.89 each D. 10,000 gadgets at $150.00 each
Solve the problem.If the area of the region at step 1 in the construction of the Koch snowflake is 36, then the area of the seed equilateral triangle in the construction is
A. 36. B. 45. C. 27. D. 9. E. none of these
Solve the problem.A standard deck of cards is made up of four suits with 13 cards in each suit (total of 52 cards). If we randomly sample four cards from a standard poker deck, find the probability that all four cards selected are diamonds.
A. 
B. 
C. 
D. 