Find the vertex of the parabola.f(x) = -4x2 - 16x - 21
A. (5, 2)
B. (-5, -2)
C. (2, 5)
D. (-2, -5)
Answer: D
Mathematics
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Find the area of the specified region.Inside one loop of the lemniscate r2 = 6 cos 2?
A. 3
B. 6
C. 12
D. 
Mathematics
Solve the problem.Sarah plans to contribute monthly to a savings account for her daughter's college education. Her goal is $300,000 in 20 years. Assume the APR is 5.4% compounded monthly and contributions are made monthly at the end of each month, including the last month. What amount does Sarah need to contribute each month? Round your answer to the nearest cent.
A. $642.81 B. $756.95 C. $696.75 D. $688.66 E. $459.57
Mathematics
Write true or false for the statement.|-69| > |-20|
A. False B. True
Mathematics
The two triangles below are similar. Find the missing length(s).
A. x = 50 B. x = 32 C. x = 38 D. x = 40
Mathematics