Add or subtract. Write the answer in lowest terms.
+ 
A. 
B. 
C. 0
D. 5
Answer: D
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Find the directrices of the ellipse.16x2 + 4y2 = 64
A. y = ± 
B. x = ± 
C. x = ± 
D. y = ± 
For the given regular polygon, find the measure of one angle.
A. 1080° B. 108° C. 120° D. 135°
Solve the problem.A product of two oscillations with different frequencies such as f(t) = sin (10t) sin(t)is important in acoustics. The result is an oscillation with "oscillating amplitude." src="https://sciemce.com/media/4/ppg__ttt0527191152__f1q36g4.jpg" alt="" style="vertical-align: -4.0px;" /> last two functions constitute an "envelope" for the function g(t). For certain values of t, the two cosine functions in g(t) cancel each other out and near-silence occurs; between these values, the two functions combine in varying degrees. The phenomenon is known (and heard) as "beats." For what values of t do the functions cancel each other?
What will be an ideal response?
the product f(t) of the two oscillations as a sum of two cosines and call it g(t).
a graphing utility, graph the function g(t) on the interval 0 ? t ? 2?.
the same system as your graph, graph y = sin t and y = -sin t.
Find the average rate of change for the function between the given values.f(x) = 
; from 1 to 5
A. -2
B. - 
C. -28
D. 