Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
dollars. The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $67.50?
A. {x ? 11 < x < 13}
B. {x ? 12 < x < 18}
C. {x ? 10 < x < 14}
D. {x ? 9 < x < 15}
Answer: D
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The number N of geese nesting in a protected area after t years is given by
.
A: Make a graph of N versus r over the first 20 years.B: What was the initial population of geese in the area? Round your answer to the nearest whole number.C: When did the population reach 109 geese? Round your answer to two decimal places if necessary.
?
?
What will be an ideal response?
Solve the problems.The speed of sound is approximately 1,088 feet per second in a particular medium. Calculate this speed in miles per hour. Round to the nearest tenth.
A. 731.8 mi./hr. B. 12.4 mi./hr. C. 744.8 mi./hr. D. 741.8 mi./hr.
Find the derivative of the function.y = cos5(?t - 15)
A. 
= - 5? cos4(?t - 15) sin(?t - 15)
B. 
= - 5? sin4(?t - 15)
C. 
= - 5 cos4(?t - 15) sin(?t - 15)
D. 
= 5 cos4(?t - 15)
Graph f by hand by first plotting points to determine the shape of the graph.f(x) = 
A. 
B. 
C. 
D. 