Simplify by writing the expression with positive exponents. Assume that all variables represent nonzero real numbers.
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.Four times a number, added to 5, is 9. Find the number.
A. 1 B. 4 C. 16 D. -1
The Armstrongs wish to establish a custodial account to finance their children's education. If they deposit $200 monthly for 10 years in a savings account paying 8% /year compounded continuously, how much will their savings account be worth at the end of this period? Round your answer to the nearest dollar. ? $__________
Fill in the blank(s) with the appropriate word(s).
Solve.The radius r of a plastic tube used in manufacturing a child's toy must not differ from the standard s by more than 2 millimeters. The manufacturing engineers express this as 
If the standard s is 50, solve the inequality for the radius r. Express the answer in set-builder notation.
A. { r 
}
B. { r 
}
C. { r 
}
D. { r 
}
Write the expression in the standard form a + bi.
A. -1 - i B. -1 + i C. 1 + i D. -1 + 2i