Eliminate the parameter of the pair of parametric equations.x = sin t, y = 3 cos t
A. 9x2 + y2 = 9
B. x2 + 9y2 = 9
C. x2 + 9y2 = 1
D. 9x2 + y2 = 1
Answer: A
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The weight w of a certain animal satisfies an equation of change. At a specific weight, the equation of change indicates that 
is positive. What can you conclude about how the animal's weight can be expected to change?
?
A. The weight will stay the same. B. The animal will gain weight. C. The animal will lose weight. D. The weight is at a minimum value.
Evaluate the integral using the given substitution.
dx , u = - 
A. - 
+ 
sin 
+ C
B. - 
+ sin3 
+ C
C. 
+ 
sin 
+ C
D. - 
+ 
sin 
+ C
Solve.The second angle of a triangle is 3 times as large as the first. The third angle is 40° more than the first. Find the measure of the smallest angle.
A. 28° B. 40° C. 140° D. 50°
Match the equation with the surface it defines.
+ 
= 
A. Figure 4 B. Figure 2 C. Figure 1 D. Figure 3