Solve the given differential equation.
+ 16y = 0
A. y = c1 sin 4x + c2 cos 4x
B. y = (c1 + c2x)e-4x
C. y = c1 sin 4x + c2x cos 4x
D. y = (c1 + c2x)e4x
Answer: A
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Find the standard deviation s for the given data. Round your answer to one more decimal place than the original data.The test scores of 40 students are summarized in the frequency distribution below. Find the standard deviation. 
A. 15.8 B. 13.5 C. 14.3 D. 15
Use the properties of real numbers to simplify the expression.-9y - 5y
A. 14y B. -14y2 C. -14y D. -4y
A die is rolled twice. Write the indicated event in set notation.The sum of the rolls is either 3 or 4.
A. {(1, 2), (2, 2)} B. {(2, 1), (3, 1), (2, 2)} C. {(1, 2), (2, 1), (1, 3), (3, 1), (2, 2)} D. {(1, 2), (1, 3), (2, 2)}
The supply equation is 
and the demand equation is 
. Find the equilibrium demand.
What will be an ideal response?