Solve the problem.A cross-country skier reaches the 10-km mark of a race 40 min after reaching the 
mark. Find the speed (average rate of change) of the skier.
A. 12 km/hr
B. 8 km/hr
C. 16 km/hr
D. 15 km/hr
Answer: A
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Solve the problem.The solid lies between planes perpendicular to the x-axis at x = -2 and x = 2. The cross sections perpendicular to the x-axis are circles whose diameters stretch from the curve 
to the curve 
Find the volume of the solid.
A. 49?
B. 49?2
C. 
?2
D. 
?2
Solve the problem. Round to an appropriate number of significant digits.Two forces, of 53.0 and 25.1 lb, forming an angle of 90.9°, act at a point in the plane. Find the magnitude of the resultant force.
A. 58.3 lb B. 59.0 lb C. 1300 lb D. 78.1 lb
Integrate the function.
A. 
+ C
B. 
+ C
C. 
+ C
D. 
+ 
+ C
Use the discriminant to determine whether the quadratic equation has two unequal real solutions, a repeated real solution, or no real solution without solving the equation.x2 - 3x + 5 = 0
A. repeated real solution B. two unequal real solutions C. no real solution