Find the sum Sn of the first n terms of the geometric sequence. 
, - 
, 
, - 
, 
, . . . .; n = 10
A. - 
B. - 
C. - 
D. - 
Answer: B
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Find the largest open interval where the function is changing as requested.Decreasing f(x) = ?x - 8?
A. (8, ?) B. (-?, 8) C. (-8, ?) D. (-?, -8)
Solve by completing the square. Give exact solutions. Simplify radicals and reduce.x2 + 3x - 9 = 0
A. 
B. 
C. -3 ± 3
D. 
Use the formula for the sum of the first n terms of a geometric sequence to solve.Find the sum of the first 9 terms of the geometric sequence: 
, 
, 
, 
, 
, . . . .
A. 
B. 
C. 73
D. 74
Solve the problem.The Paperback Trader is a book store that takes in used paperbacks for 20% of their cover price and sells them for 50% of their cover price. Pat brings in a stack of 17 paperback books to trade and gets $17.17 credit. Some of the books had a cover price of $6.99, the rest $3.99. She wants to get some Tom Clancy books having a cover price of $6.99. How many $6.99 books did she bring in and how many Clancy books can she get without paying any additional cash?
A. 11 $6.99 books, 2 Clancy books B. 6 $6.99 books, 4 Clancy books C. 6 $6.99 books, 2 Clancy books D. 6 $6.99 books, 5 Clancy books