Use a calculator to find the approximate value of the expression. Express your answer in radians and round to three decimal places.csc-1 (-4.9140)
A. 6.488
B. 3.347
C. -2.937
D. 2.550
Answer: C
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Determine if the given function y = f(x) is a solution of the accompanying differential equation.Differential equation: xy' + y = 
Initial condition: y(7) = 2Solution candidate: y = 
+ 
A. No B. Yes
Solve and graph.x ? 4 or x ? 5
A. (4, 5)
B. [-5, -4]
C. (-4, 5)
D. (-?, 4] ? [5, ?)
Determine whether the equation is a linear equation in two variables.x = 5
A. yes B. no
Solve the problem.The cost C of producing t units is given by C(t) = 3t2 + 8t, and the revenue R generated from selling t units is given by 
For what values of t will there be a profit?
A. There will be a profit when more than 9 units are sold. B. There will be a profit when more than 7 units are sold. C. There will be a profit when more than 8 units are sold D. There will be a profit when 0 units are sold.