Perform the indicated operation. Write the result in the form a + bi.
? 
A. -21i
B. -21
C. 21
D. 21i2
Answer: B
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Use the graph to find a ? > 0 such that for all x, 0 < 
< ? ? 
< ?.
A. 0.16 B. 4 C. 0.17 D. 0.33
Solve the problem.
Barbara knows that she will need to buy a new car in 3 years. The car will cost $15,000 by then. How much should she invest now at 6%, compounded quarterly, so that she will have enough to buy a new car?
A. $13,349.95 B. $13,727.12 C. $11,881.40 D. $12,545.85
Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y. 3x + y = 6-6x - 2y = -12
A. 
or (y, -3y + 6)
B. (x, 3x + 6) or 
C. (x, -3x + 6) or 
D. no solution
True or False?The given table corresponds to the function 
.
x -3 -2 -1 0 1 2 3 f(x) -0.992 -0.96 -0.8 0 4 24 124
Answer the following statement true (T) or false (F)