Find the angle.sec-1 -
A. 
B. 
± 2?n, 
± 2?n
C. 
D. 
Answer: A
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Find 
by using the Chain Rule. Express your final answer in terms of t.w = ex cos y + ey cos x; x = 9t, y = -4t
A. e-4t(9 cos -4t + 4 sin -4t) e9t(-4 cos 9t - 9 sin 9t) B. e9t(9 cos -4t + 4 sin -4t) e-4t(-4 cos 9t - 9 sin 9t) C. e-4t(9 cos -4t - 4 sin -4t) e9t(-4 cos 9t + 9 sin 9t) D. e9t(9 cos -4t - 4 sin -4t) e-4t(-4 cos 9t + 9 sin 9t)
Use the properties of limits to evaluate the limit if it exists.
A. 0
B. 2
C. Does not exist
D. 
Solve the problem.One fifth of Joan's earned income is deducted for withholdings. Three tenths of the withholdings are for federal income tax. What fraction of Joan's earned income is deducted for federal income tax?
A. 
B. 
C. 
D. 
Find the quotient. Simplify the answer.
÷ 
A. 
B. 
C. 
D. 