Solve the problem.Suppose that the dollar cost of producing x radios is 
Find the marginal cost when 45 radios are produced.
A. $48
B. $12
C. $1545
D. -$1545
Answer: B
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Write a system of linear equations that models the situation. Do not solve.A truck is driven for 4 hours, part of the time at 20 miles per hour and the rest of the time at 60 miles per hour. The total distance traveled was 
miles. How long did the truck travel at each speed?
A. x + y = 4 20x + 60y = 200 B. x + y = 200 20x + 60y = 4 C. x - y = 4 20x - 60y = 200 D. x + y = 40 60x + 20y = 200
Solve the equation.x4 = 1
A. -1, 0, 1 B. -1, 0 C. 0, 1 D. -1, 1
Provide an appropriate response.Which one of the following is a description of the graph of the solution set for the system below?16x2 + 25y2 < 400y < -4
A. Outside the ellipse and below the line B. Outside the ellipse and above the line C. Inside the ellipse and above the line D. Inside the ellipse and below the line
Solve the problem.The focal length f of a lens with index of refraction n is 
= (n - 1)
where R1and R2 are the radii of curvature of the front and back surfaces of the lens. Express f as a rational expression.
What will be an ideal response?