Find the derivative of y.y = sech (-3?) (1 - ln sech(-3?))
A. 1 + 3 sech (-3?) tanh (-3?) ln sech (-3?)
B. -3 sech (-3?) tanh (-3?) ln sech (-3?)
C. -3 sech (-3?) tanh (-3?) ln (-3?)
D. sech (-3?) tanh (-3?) ln sech (-3?)
Answer: B
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Find an equation of an ellipse satisfying the given conditions.Foci at (-4, 0), (4, 0); vertices at (-7, 0), (7, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Find the sum.- 
+ 
A. 
B. 
C. 
D. 
Simplify the expression. Write your answer without negative exponents. Whenever an exponent is negative or zero, assume that the base is not zero.(2-5) ? (22)
A. 4
B. 8
C. 
D. 
Solve the problem.Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A(t) = 890e-0.73t. Find the rate of change of the quantity present at the time when t = 5.
A. 38 grams per year B. 16.9 grams per year C. -38 grams per year D. -16.9 grams per year