Solve the problem.A projectile is thrown upward so that its distance above the ground after t seconds is 
After how many seconds does it reach its maximum height?
A. 17 s
B. 8 s
C. 34 s
D. 25.5 s
Answer: A
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Find the standard-form equation of the ellipse centered at the origin and satisfying the given conditions.An ellipse with a vertex at (0, 7) and a focus at (0, -3).
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Solve the problem.The barometric pressure p at an altitude of h miles above sea level satisfies the differential equation 
If the pressure at sea level is 29.92 inches of mercury, find the barometric pressure at 27,000 ft.
A. 83.2 in. B. 5.38 in. C. 0.14 in. D. 10.76 in.
Solve the problem.Find the centroid of the rectangular solid defined by 
, 
, 
.
A. 
= 2,
= 1, 
= 
B. 
= 1, 
= 
, 
= 
C. 
= 
, 
= 
, 
= 3
D. 
= 4, 
= 2, 
= 9
Simplify the expression. Assume that all variables are positive when they appear.
A. -4x8y8 B. 16x8y8 C. 4x8y8 D. -4x12y12