Replace the Cartesian equation with an equivalent polar equation.x2 - y2 = 4
A. cos2? - sin2? = 4r
B. r2 cos 2? = 4
C. r cos 2? = 4
D. cos2? - sin2? = 4
Answer: B
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (10t - 5t3)i + 2tan(3t)j + e3tk
A. a
= - 
?i - 72j + 9e1/4?k
B. a
= - 
?i - 72j + 9k
C. a
= - 
?i + 72j + 9e1/4?k
D. a
= 
?i + 72j + 9e1/4?k
Mathematics
Add.
A. 101,997 B. 90,897 C. 90,997 D. 91,997
Mathematics
Solve.(11x - 7)2 = 12
A. x = ± 2
B. x = - 
, x = 
C. x = 
D. x = 
Mathematics
Find the domain of the expression.
?
?
A. All real numbers x such that x ? 8 B. All real numbers x such that x ? 2 C. All real numbers x such that x> 2 D. All real numbers x E. All real numbers x such that x> 8
Mathematics