Decide whether the given set of numbers is a group under the given operation.Whole numbers; addition
A. Yes
B. No
Answer: B
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Find the probability.An unprepared student makes random guesses for the ten true-false questions on a quiz. Find the probability that there is at least one correct answer.
A. 
B. 
C. 
D. 
Determine whether the function is one-to-one by graphing and using the horizontal line test.f(x) = 
A. Yes B. No
Solve the problem. If necessary, round to the nearest tenth, unless intructed otherwise.Tickets for a play are sold at two prices; $18, and $30. Find a formula for the total cost T (in dollars) of k tickets that sold for $18 per ticket and n tickets that sold for $30 per ticket.
A. T = 18k - 30n B. T = 30k + 18n C. T = 48kn D. T = 18k + 30n
Find the vertex, focus, and directrix of the parabola with the given equation.(x + 4)2 = -4(y + 1)
A. vertex: (-4, -1) focus: (-4, -2) directrix: y = 0 B. vertex: (-1, -4) focus: (-1, -5) directrix: y = -3 C. vertex: (-4, -1) focus: (-4, 0) directrix: x = -2 D. vertex: (4, 1) focus: (4, 0) directrix: y = 2