Find the circumference and area of the circle. Use 3.14 for ?. Round your results to the nearest tenth.
A. C ? 11.9 mi, A ? 11.3 mi2
B. C ? 6.0 mi, A ? 45.3 mi2
C. C ? 11.9 mi, A ? 11.9 mi2
D. C ? 6.0 mi, A ? 23.9 mi2
Answer: A
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Solve the problem.An airline charter service charges a fare per person of $200 plus $20 for each unsold seat. The airplane holds 200 passengers. Let x represent the number of unsold seats and write an expression for the total revenue R for a charter flight.
A. R(x) = (200 - x)(200 + 20x) or 40,000 + 4,000x - 20x2 B. R(x) = (200 - x)(200 + 20x) or 40,000 + 3,800x - 20x2 C. R(x) = 200(200 + 20x) or 40,000 + 4,000x D. R(x) = x(200 + 20x) or 200x + 20x2
Solve and simplify.
+ x = 
A. x = 
B. x = 
C. x = 
D. x = 
The region bounded by the given curves is rotated about the specified axis. Find the volume of the resulting solid by any method.
about the y-axis
Select the correct answer.
Use the properties of exponents to simplify the expression 
.
?
A. ?
B. ?
C. ?
D. ?
E. ?