Replace the Cartesian equation with an equivalent polar equation.x2 + 4y2 = 4
A. cos2? + 4 sin2? = 4r
B. r2(4 cos2? + sin2?) = 4
C. r2(cos2? + 4 sin2?) = 4
D. 4 cos2? + sin2? = 4r
Answer: C
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Solve the equation.x2 = -18x - 81
A. {-9, 9} B. {-9} C. {0, 9} D. {9}
Use the table of record trout lengths at Yosemite Lake to answer the question. To find the average, add up the values you are interested in and then divide the sum by the number of values. Round your answer to the nearest tenth. 
Find the average length of record trout caught during a weekday.
A. 19.8 in. B. 14.2 in. C. 14.6 in. D. 72.9 in.
Provide an appropriate response.True or false: For all angles ?, tan ? + 1 = sec ?. If false, give an example showing why it is false.
What will be an ideal response?
Solve the problem.The intensity of the reaction to a certain drug, in appropriate units, is given by 
where t is time (in hours) after the drug is administered. Find the average intensity during the 6th hour.
A. 775e-0.24 - 800e-0.28 B. 750e-0.2 + 625e-0.24 C. -0.8e-0.2 - 775e-0.24 D. 750e-0.2 - 775e-0.24