Assume that 0 < ? < ?/2. Find an expression for the indicated trigonometric function.Let x = 2 tan ? in 
. Find cos ?.
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Find a1, r, an, n, or Sn for the geometric sequence, as instructed.a1 = 1408, r = 
, n = 4; Find an.
A. - 
B. -22
C. 22
D. 
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Solve the problem.A semicircular driveway has a diameter of 60 ft. How long is the driveway?(Use 3.14 for ? .)
A. 92.2 ft B. 600 ft C. 94.2 ft D. 188.4 ft
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Perform the indicated operations.(-9x2y - xy) + (6x2y + 5xy)
A. 15x2y + 6xy B. -3x2y + 6xy C. 15x2y + 4xy D. -3x2y + 4xy
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Write in decimal notation.8.122 × 10-5
A. 0.00008122 B. 0.0008122 C. -812,200 D. 0.000008122
Mathematics