Simplify. Write your answer in the form a + bi, where a and b are real numbers.(-7 + 2i) + (13 + 7i)
A. -6 + 9i
B. 6 + 16i
C. 6 + 9i
D. 13 + 9i
Answer: C
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Solve the problem.Determine whether the ordered triple (2, 8, -3) is a solution of the system of equations.3x - 4y - 2z = -204x + y - z = 19 x - 2y + 3z = -23
A. Yes B. No
Completely factor the polynomial or state that the polynomial is prime.x2 - x - 72
A. (x + 9)(x - 8) B. prime C. (x + 1)(x - 72) D. (x + 8)(x - 9)
Use the method of natural frequencies to find the indicated probability.Refer to the table which summarizes the results of testing for a certain disease. 
A test subject is randomly selected and tested for the disease. What is the probability the subject has the disease given that the test result is negative?
A. 0.022 B. 0.978 C. 0.223 D. 0.073
Graph the curve whose parametric equations are given.x = -sec t, y = tan t; - 
< t < 
A. 
B. 
C. 
D. 