Solve the problem.A theatre sells two types of tickets to their plays; children's tickets and adult tickets. For today's performance they have sold a total of 1230 tickets. Also, they have sold 4 times as many adult tickets as children's tickets. How many adult tickets have they sold?
A. 984
B. 977
C. 981
D. 990
Answer: A
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Obtain the Cartesian equation of the curve by eliminating the parameter.x = t3 - 9t, y = t2 - 9
A. 9x2 = y3 + 9y2 B. x2 = 9y3 + y2 C. x3 = y3 + 9y2 D. x2 = y3 + 9y2
Find the cardinal number of the set.Given:n(U) = 60 n(A) = 30 n(B) = 16 n(A ? B) = 6Find n(A ? B)'.
A. 46 B. 20 C. 40 D. 14
For the triangle, based on the side lengths given, decide whether it is equilateral, isosceles, or scalene. 
A. equilateral and isosceles B. isosceles C. scalene
Solve the problem. Use the theorem for error estimation for alternating series to perform the indicated error estimation.The income distribution for a certain country is represented by the Lorenz curve with the equation 
. Approximate the index of income concentration to within ± 0.005.
A. 0.740 B. 0.833 C. 0.731 D. 0.733