Solve the problem.If two sound sources at the same volume are equidistant from a microphone, the pressure on the microphone is given by p = a cos ?1t + a cos ?2twhere a, ?1, ?2 are constants and t is time. Write p as a product of cosine functions.
What will be an ideal response?
p = 2a cos (
t) cos (
t)
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Prepare a vertical analysis. Round percents to the nearest tenth of a percent. Rosie's Cleaning Service had a cost of goods sold of $44,000, operating expenses of $216,000, and net sales of $380,000.
A. Percent cost of goods sold = 11.6% Percent operating expenses = 68.4% B. Percent cost of goods sold = 68.4% Percent operating expenses = 11.6% C. Percent cost of goods sold = 56.8% Percent operating expenses = 11.6% D. Percent cost of goods sold = 11.6% Percent operating expenses = 56.8%
Perform the indicated operation. Assume that all variables represent nonnegative real numbers.11
- 5x
A. 16
B. 6x
C. 11
- 5x
D. 6x
Find the function value.Let f(x) = 
. Find f
.
A. 
B. 
C. - 
D. - 
Add or subtract as indicated. Simplify if necessary.- 
- 
A. 
B. - 
C. 
D. - 