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. 20 months
B. 8 months
C. 10 months
D. 12 months
Answer: A
Mathematics
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Find the exact value by using a sum or difference identity.cos 285°
A. 
B. -
(
- 1)
C. - 
D. -
(
+ 1)
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Evaluate.Let a = (cos ?)i + (sin ?)j , b = 
i + 
j. Find a + b.
A. i - j B. -i - j C. -i + j D. i + j
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Write an equation for the line described. Write the equation in the form specified.perpendicular to 2x - 5y = -19, through (3, -5); slope-intercept form
A. y = 
x + 
B. y = - 
x - 
C. y = - 
x - 
D. y = - 
x + 
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Evaluate the algebraic expression for the indicated variable.
for x = 7, y = 4
A. 
B. 
C. 
D. 
Mathematics