Graph the function.y = - 
sin 
A. 
B. 
C. 
D. 
Answer: C
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Solve the system by the method of substitution.
A) (3, 2)
B) (2, 3)
C) (2, –3)
D) (–3, 2)
E) (–2, 3)
Solve the problem.A balloon is rising vertically at a distance of 
from an observer. When the angle of elevation is 
it is changing at a rate of 
How fast is the balloon ascending?
A. 5.6 ft/s B. 3.0 ft/s C. 3.3 ft/s D. 2.8 ft/s
Write the expression in the form a + bi, where a and b are real numbers.
(
+ 
)
A. 10 - 20i B. 20 + 10i C. -20 - 10i D. -10 + 20i
The price of a certain commodity in dollars per unit at time t (measured in weeks) is given by
?
.
?
What is the price of the commodity at t = 0?
?
$__________ / unit
?
How fast is the price of the commodity decreasing at t = 0?
?
$__________ / wk
?
Find the equilibrium price of the commodity. (Hint: It's given by 
. Also, use the fact that 
.)
?
$__________ / unit
What will be an ideal response?