Find the derivative of y.y = sech (-2?) (1 - ln sech(-2?))
A. sech (-2?) tanh (-2?) ln sech (-2?)
B. 1 + 2 sech (-2?) tanh (-2?) ln sech (-2?)
C. -2 sech (-2?) tanh (-2?) ln (-2?)
D. -2 sech (-2?) tanh (-2?) ln sech (-2?)
Answer: D
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Evaluate the integral by using multiple substitutions.
dy
A. 6 sin2 
+ C
B. 
cos4 
+ C
C. 
sin4 
+ C
D. 2 sin4 
+ C
Simplify.
2 + 
A. 
B. 
C. 
D. 
Solve the problem.A box of instant brownies has the list of ingredients shown in the table. Use this information to find the amount of the stated ingredient you would need to make the indicated number of servings.
Water3 tablespoonsOil
cupNuts
cupBrownie Mix2
cupsAmount of water for 10 servings
A. 
cups
B. 
ounces
C. 3
tablespoons
D. 2
tablespoons
Solve the system by substitution.
A. (-13, 0), (12, 5), (12, -5) B. (-13, 0), (12, 25), (12, -25) C. (12, 5), (12, -5) D. empty set