Simplify. Write your answer in the form a + bi, where a and b are real numbers.(-4 - 6i) + (11 + 4i)
A. 11 - 2i
B. 7 + 2i
C. 11 + 2i
D. 7 - 2i
Answer: D
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Perform the operation and give the answer in the same numeration system. Write the answer as simply as possible.Subtract MDCCCVII from MCMXIII
A. CVI B. LXI C. MCCVI D. MDCCVI
Solve.A ball is thrown downward with an initial velocity of 14 meters per second from a cliff that is 
high. The height of the ball is given by the quadratic equation 
where h is in meters and t is the time in seconds since the ball was thrown. Find the time it takes the ball to hit the ground. Round your answer to the nearest tenth of a second.
A. 1.4 sec B. 2.4 sec C. 1.5 sec D. 1.3 sec
Write the inequality using interval notation, and illustrate the inequality using the real number line.y < -4
A. (-?, -4)
B. (-?, -4]
C. [-?, -4)
D. [-?, -4]
Use the addition rule to solve the problem.A lottery game has balls numbered 1 through 21. What is the probability of selecting an even numbered ball or a 5?
A. 
B. 
C. 
D. 