Solve the problem.If friction is ignored, the time t (in seconds) required for a block to slide down an inclined plane is given by the formula t = 
where a is the length (in feet) of the base and g ? 32 feet per second per second is the acceleration of gravity. How long does it take a block to slide down an inclined plane with base a = 13 when 
If necessary, round the answer to the nearest tenth of a second.
A. 0.3 sec
B. 2.3 sec
C. 1.3 sec
D. 1.1 sec
Answer: C
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Find the standard-form equation of the hyperbola centered at the origin which satisfies the given conditions.A vertex at (0, 7) and a focus at (0, -10).
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Verify that the matrix is invertible and find its inverse.A = 
A. A-1 = 
B. A-1 = 
C. A-1 = 
D. A-1 = 
Find the difference. Simplify the result.
- 
A. 
B. 
C. 
D. 
Use the following information to solve the problem. An airport is located at point O. A short-range radar tower is located at point R. The maximum range at which the radar can detect a plane is 4 miles from point R.Assume that R is 9 miles east of O and 12 miles north of O. In other words, R is located at the point 
. An airplane is flying parallel to and 6 miles east of the north axis. (In other words, the plane is flying along the path 
.) What is the greatest distance north of the airport at which the plane can still be detected by the radar tower at R? Round your
answer to the nearest tenth of a mile. A. 14.6 miles B. 9.4 miles C. 15.6 miles D. 16.1 miles