Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.2 x + 7 = 8
A. {-4.00}
B. {-0.24}
C. {7.33}
D. {1.18}
Answer: A
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 
B. -4
C. 2
D. - 
Use the quadratic formula to solve the equation.6x2 + 12x = - 3
A. 
B. 
C. 
D. 
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
A. 
B. 10
C. 
D. 
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083