Solve the problem.In a particular situation, the pressure, P, exerted on a person's eardrum at a distance of 8 feet from the source is given by the function: P(t) = 
cos (2n? - ct) , where n is a positive integer. Use the difference identity for cosine to simplify P in this situation.
A. P(t) = 
cos (ct)
B. P(t) = 
cos (ct + 8)
C. P(t) = 
cos (ct) - 
sin (ct)
D. P(t) = cos (ct)
Answer: A
Mathematics
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Write the statement in symbols, using x as the variable, and find the solution by guessing or by using trial and error. All solutions come from the list of integers between -12 and 12 inclusive.The quotient of a number and 3 is -4.
A. 
= 3; -12
B. 3x = - 
; - 
C. 
= 3; -4
D. 
= -4; -12
Mathematics
Add. Write a mixed numeral for the answer.
A. 10
B. 11
C. 10
D. 10
Mathematics
Solve. Write a mixed numeral for the answer.The front cover of a book measures 7
inches by 5
inches. What is the total distance around (the perimeter of) the front cover of the book?
A. 12
in.
B. 25
in.
C. 25
in.
D. 24
in.
Mathematics
Solve the system by Gaussian elimination.
a. 
b. 
c. 
d. 
Mathematics