Determine whether the function is a solution of the wave equation.w(x, t) = sin (-9x - 9ct)
A. Yes
B. No
Answer: A
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Find the rectangular coordinates for the point for which the polar coordinates are given.
A. (6
, 6
)
B. (6
, -6
)
C. (-6
, 6
)
D. (-6
, -6
)
Answer the question.True or False: The graph of the equation 9x - 15y = 30 goes through 
A. False B. True
Solve the problem.The temperature (in degrees Fahrenheit) of a dead body that has been cooling in a room set at 70° is measured as 88°. One hour later, the body temperature is 87.5°. How long (to the nearest hour) before the first measurement was the time of death, assuming that the body temperature of the deceased at the time of death was 98.6°. Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt.
What will be an ideal response?
Perform the matrix multiplication.Find AB for A = 
and B = 
.
A. 
B. 
C. 
D. 