Find the cross-product and determine whether the proportion is true or false.
= 
A. 72 = 72; true
B. 8 ? 162; false
C. 18 ? 72; false
D. 36 = 36; true
Answer: D
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If 
, find a formula for 
.
?
A. 
B. 
C. 
D. 
Write the expression as the sum or difference of logarithms.logb 
A. 
logb x + 8 - 2logb y
B. 
logb x + 2 - 2logb y
C. 
logb x + 2 - 
logb y
D. 
(logb x9 + logb b8 - logb y2)
Solve the problem.In a Psychology class, the students were tested at the end of the course on a final exam. Then they were retested with an equivalent test at subsequent time intervals. Their average scores after t months are given in the table.
Using a graphing utility, fit a logarithmic function y = a + b ln x to the data. Using the function you found, estimate how long will it take for the test scores to fall below 84%. Express your answer to the nearest month.
A. 12 months B. 20 months C. 8 months D. 10 months
A point lying on the terminal side of angle ? is given. Find the exact value of the indicated trigonometric function of ?.(18, 24) Find csc ?.
A. 
B. 
C. 
D. 