Write the expression in the standard form a + bi.
A. -i
B. 1
C. i
D. -1
Answer: C
Mathematics
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Assume that all variables are implicit functions of time t. Find the indicated rate.x2 + 2y2 = 19; dx/dt = 3 when x = 1 and y = 3; find dy/dt.
A. -0.5 B. 0.5 C. 0.22 D. -0.22
Mathematics
Evaluate the integral.
A. 
sec 9x tan 9x - 
ln
+ C
B. 
sec 9x tan 9x + 
ln
+ C
C. 
sec 9x tan 9x + 
+ C
D. 
sec29x tan 9x + 
ln
+ C
Mathematics
Determine if the equation is an identity.1 - cos 2x - sin2 x = sin2 x
A. No B. Yes
Mathematics
Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.(4x)-3
A. - 64x2
B. - 
C. -12x
D. 
Mathematics