Solve the problem.A cross-country skier reaches the 13-km mark of a race 40 min after reaching the 
mark. Find the speed (average rate of change) of the skier.
A. 27 km/hr
B. 
km/hr
C. 
km/hr
D. 9 km/hr
Answer: C
Mathematics
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Construct a phase line. Identify signs of y' and y".
= (y + 1)(y - 2)
A. 
B. 
C. 
D. 
Mathematics
Find dy/dt.y = cos7(?t - 20)
A. 7 cos6(?t - 20) B. -7? cos6(?t - 20) sin(?t - 20) C. -7 cos6(?t - 20) sin(?t - 20) D. -7? sin6(?t - 20)
Mathematics
Find the particular solution to the given differential equation that satisfies the given conditions.2(x dy + y dx) + 15x2 dx = 0; x = 1 when y = 4
A. 2xy + 5x3 = c B. 2xy + 5x3 = 7 C. 2xy + 5x3 = 13 D. 2xy + 5x3 = 328
Mathematics
Decide whether the figure shown is a polyhedron.
A. Not a polyhedron B. Polyhedron
Mathematics