Solve the problem.What is the commission from the sale of $790 worth of books, if the commission rate is 9%?
A. $71.10
B. $79.00
C. $63.2
D. $711.00
Answer: A
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Apply Green's Theorem to evaluate the integral.
(4y dx + 2y dy)C: The boundary of 0 ? x ? ?, 0 ? y ? sin x
A. -2 B. -4 C. 0 D. 4
Solve the problem.If the switch is thrown open after the current in an RL circuit has built up to its steady-state value, the decaying current obeys the equation 
How long after the switch is thrown open will it take the current to fall to 
of its original value?
A. 1.12 L/R seconds B. -4.60 L/R seconds C. -4.40 L/R seconds D. 0.92 L/R seconds
Determine whether the equation is quadratic.x3 - 9x2 + x = 0
A. No B. Yes
In the circuit below, find IT in polar form if IR = 12 mA and IC = 8 mA.
a. 20 /33.7è mA
b. 14.4 /56.3è mA
c. 14.4 /33.7è mA
d. 21.6 /33.7è mA
e. 21.6 /56.3è mA