Solve the problem.An appliance store had monthly sales of $55,200 and spent 14% of it on advertising. How much was spent on advertising?
A. $7728
B. $394,286
C. $77,280
D. $39,429
Answer: A
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Factor completely.25z4 - 10z2 - 8
A. (5z2 + 2)(5z2 - 4) B. (5z4 + 2)(5z - 4) C. (5z2 + 4)(5z2 - 2) D. (5z4 + 4)(5z - 2)
Write the word phrase as an algebraic expression. Use x to represent the unknown number.The quotient of a number and 4, decreased by 9
A. 
B. 
- 9
C. 
D. 
- 9
Use Bayes' rule to find the indicated probability.The incidence of a certain disease on the island of Tukow is 4%. A new test has been developed to diagnose the disease. Using this test, 91% of those who have the disease test positive while 4% of those who do not have the disease test positive (false positive). If a person tests positive, what is the probability that he or she actually has the disease?
A. 0.438 B. 0.487 C. 0.91 D. 0.856
Find the special product.(2 - 11r)(2 + 11r)
A. 4 - 121r2 B. 4 - 11r2 C. 4 + 44r - 121r2 D. 4 - 44r - 121r2