Use the even-odd properties to find the exact value of the expression. Do not use a calculator.sec (-?)
A. 0
B. 1
C. -1
D. undefined
Answer: C
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Plot the curve of the given polar equation in polar coordinates.r = 4 sin ?
A. 
B. 
C. 
D. 
Add or subtract as indicated. Write a sentence answering the question.A hiker started the day with 5.7 liters of water. At the first break, she drank 285 milligrams of water. How many dekaliters of water remained?
A. 54.15 dekaliters of water remained. B. 2.85 dekaliters of water remained. C. 5.415 dekaliters of water remained. D. 0.5415 dekaliter of water remained.
Provide an appropriate response.How do you find Dz when solving a system of equations using Cramer's Rule?
A. Replace the x-column and y-column values with the constant-column values. B. Replace the z-column values with the constant-column values. C. Replace the x-column values with the constant-column values. D. Replace the y-column values with the constant-column values.
Solve the problem.The logistic growth model 
represents the population of a species introduced into a new territory after t years. When will the population be 80?
A. 18.5 years B. 6.08 years C. 21.02 years D. 8.6 years