Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. 
C. 
D. 
Answer: D
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Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. infinitely many solutions; {
-6x + 4y = -6} or {
12y = -18 + 18x}
B. {(-6, 4)}
C. no solution; ?
D. {(0,0)}
Solve the problem.In 9 weeks, the value of Bob Treatman's day trading account decreased by $207. What was the average weekly change in the value of the account?
A. -$29 per week B. $21 per week C. -$25 per week D. -$23 per week
Round the number to the given place value.In the past year, a company spent $793,749,766 on advertising. Round the advertising figure to the nearest hundred thousand.
A. $800,000,000 B. $793,700,000 C. $700,000,000 D. $793,800,000
Write the expression in the standard form a + bi.
A. -i B. -1 C. 1 D. i