Provide an appropriate response.At the two points where the curve x2 + 2xy + y2 = 4 crosses the x-axis, the tangents to the curve are parallel. What is the common slope of these tangents?
A. 1
B. -1
C. 0
D. -2
Answer: B
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Evaluate the expression for the given value or values.x - 2yz for x = 90, y = 3, z = 5
A. 420 B. 1320 C. 60 D. 80
Solve the rational equation.
+ 
= 
A. 
B. 
C. 
D. 
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. An insurance company is willing to insure the concert for $150,000 against rain for a premium of $30,000. If he buys this policy, what are his expected earnings from the concert?
A. $180,000 B. $300,000 C. $270,000 D. $239,400
Solve the problem.A racetrack curve is banked so that the outside of the curve is slightly elevated or inclined above the inside of the curve. This inclination is called the elevation of the track. The maximum speed on the track in miles per hour is given by
where r is the radius of the track in miles and ? is the elevation in degrees. Find the maximum speed for a racetrack with an elevation of 28° and a radius of 
Round to the nearest mile per hour.
A. 13,526 mph B. 39,350 mph C. 198 mph D. 175 mph