Solve the problem.The annual revenue and cost functions for a manufacturer of grandfather clocks are approximately 
and 
, where x denotes the number of clocks made. What is the maximum annual profit?
A. $1,333,333
B. $1,433,333
C. $1,233,333
D. $1,533,333
Answer: C
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Solve the application problem.A recent advertisement claimed that 2 out of every 7 doctors recommend a certain herbal supplement to increase energy levels. If a local hospital employs 280 doctors, how many doctors would you expect to recommend the supplement? (Round to the nearest whole number, if necessary.)
A. 80 doctors B. 980 doctors C. 3920 doctors D. 40 doctors
Solve the problem.The diameter of a tree was 11 in. During the following year, the circumference increased 
About how much did the tree's diameter increase?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Replace the polar equation with an equivalent Cartesian equation.r cos ? = 7
A. 7y = 1 B. y = 7 C. x = 7 D. 7x = 1
Find the distance between points P1 and P2. P1(-1, -2, -8) and P2(2, -6, -3)
A. 10
B. 25
C. 5
;
D. 50