Use De Moivre's theorem to simplify the expression. Write the answer in the form a + bi.
3
A. -4
+ 4i
B. 4 - 4i
C. 4
- 4i
D. -4
- 4i
Answer: C
Mathematics
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Use an inverse matrix to find the solution to the system.
A. x = 1, y = 5, z = 1 B. x = 8, y = -1, z = 5 C. x = 7, y = 1, z = 5 D. x = 7, y = -1, z = -5
Mathematics
Suppose 100 people counted the number of cars passing an intersection in one hour. Due to error, not all people get the same value. The mean is 75 and the standard deviation is 1. Use the sketch to find how many people report the following. 
More than 1 car away from the mean
A. 68 people B. 34 people C. 16 people D. 32 people
Mathematics
Factor the difference of two squares.49x2 - 9
A. (7x + 3)2 B. (7x + 3)(7x - 3) C. (7x - 3)2 D. (49x + 1)(x - 9)
Mathematics
Solve the problem.The sum of an integer and its reciprocal is 17/4. Find the integer.
A. 17 B. 4 C. 3 D. 5
Mathematics