Use the formula for the sum of the first n terms of an arithmetic sequence to find the indicated sum.
A. -2145
B. -1989
C. -1852.5
D. -2086.5
Answer: A
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Solve the problem. Round your answer to the nearest tenth unless indicated otherwise.In a certain medium, sound travels at a speed of 7929 feet per second. How many meters per second does sound travel in this medium? Round to the nearest tenth.
A. 7215.4 m/s B. 26,007.1 m/s C. 3092.3 m/s D. 2378.7 m/s
Solve.A polygon with n sides has D diagonals, where D is given by the function D(n) = 
. Find the number of sides n if 104 ? D ? 135.
A. {n|16 ? n ? 18} B. {n|17 ? n ? 18} C. {n|14 ? n ? 19} D. {n|15 ? n ? 19}
Write as the sum and/or difference of logarithms. Express powers as factors.ln 
, x > 4
A. 7ln x + 
ln (1 + 3x) - 9ln (x - 4)
B. ln 7 + ln x - 11ln (1 + 3x) - 9ln (x - 4)
C. ln 7 + ln x + 
ln (1 + 3x) - ln 9 - ln (x - 4)
D. ln 7 + ln x + 
ln (1 + 3x) - 9ln (x - 4)
Find the exact value of 
.
?
A. 
B. 
C. 
D. 
E. 