Find the standard equation of the hyperbola.Foci at (0, ±7), a conjugate axis with length 10
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Answer: B
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Evaluate the function.X(x, y) = cos(y sin x); find X
.
A. 
B. 
C. - 
D. - 
Find the absolute extreme values of each function on the interval.f(x) = ln (-x), -8 ? x ? -1
A. Maximum value is 0 at x = -1; minimum value is -ln 8 at x = -8 B. No minimum value; no maximum value C. Minimum value is 0 at x = -1; no maximum value D. Minimum value is 0 at x = -1; maximum value is ln 8 at x = -8
Graph the function. Specify the intervals over which the function is increasing and the intervals where it is decreasing.y = - 
A. Decreasing -? < x < 0 and 0 < x < ?
B. Increasing -? < x < 0 and 0 < x < ?
C. Decreasing -? < x < 0
Increasing 0 < x < ?
D. Increasing -? < x < 0
Decreasing 0 < x < ?
Solve the problem.The water in a tank weighs 237.82 lb. One cubic foot of water weighs 62.5 lb. How many cubic feet of water are in the tank?
A. 300.32 cubic feet B. 0.26280 cubic feet C. 3.80512 cubic feet D. 14,863.750 cubic feet