Solve the problem.The temperature of water in a certain lake on a day in October can be determined by using the model 
where x is the number of feet down from the surface of the lake and y is the Celsius temperature of the water at that depth. Based on this model, how deep in the lake is the water 9 degrees? (Round to the nearest foot.)
A. 45
B. 12
C. 67
D. 30
Answer: B
Mathematics
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Provide an appropriate response.Find the fundamental matrix F for the absorbing Markov chain with the given matrix. Express your answer in fraction form.
A. F = 
B. F = 
C. F = 
D. F = 
Mathematics
A sector of area 
in2 is formed by a central angle of 45°. What is the radius of the circle?
?
If the answer needs rounding, round it to three significant digits.
?
r = __________ inches
What will be an ideal response?
Mathematics
Evaluate the exponential function for the given value.f(x) = 3x, f(2)
A. 6 B. 9 C. 27 D. 8
Mathematics
Solve the equation.-9x = -54
A. 6 B. -45 C. -6 D. 45
Mathematics