Find the derivative of y.y = ln(sech (9x + 8))
A. -9 tanh (9x + 8)
B. 
C. -tanh (9x + 8)
D. tanh (9x + 8)
Answer: A
Mathematics
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Evaluate the integral by using a substitution prior to integration by parts.
A. x 
2 + 2x 
- 2x + C
B. x 
2 - 2x 
+ C
C. x 
2 - 2x 
+ 2x + C
D. x 
2 - x 
+ x + C
Mathematics
Determine the number of spanning trees in the graph.
A. 59 B. 17 C. 60 D. 16
Mathematics
Solve the problem.The distribution of weights of students at a high school has a mean of 143 lb, a median of 
and modes at 
and 
State whether you think the distribution of weights is normal, rectangular, 
or 
Explain your
answer. What will be an ideal response?
Mathematics
Find the LCD for the given fractions.
and 
A. 50 B. 225 C. 5 D. 45
Mathematics