Sin t and cos t are given. Use identities to find the indicated value. Where necessary, rationalize denominators.sin t = 
, cos t = 
. Find sec t.
A. 
B. 
C. 
D. 
Answer: B
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Find the center of mass of a thin plate of constant density covering the given region.The region bounded by the parabola x = y2 and the line x = 9
A. 
= 9, 
= 0
B. 
= 0, 
= 
C. 
= 36, 
= 0
D. 
= 
, 
= 0
Find the measure of the indicated angle. Figure is not drawn to scale.
A. 60°34' B. 60°17' C. 62°47' D. 60°38'
Solve the problem.Doctors predict that by administering a vaccine, the number of new cases of a certain childhood disease will decrease by half each year. If 1100 people were afflicted with the disease in 2010, estimate the number of new cases in 2015. (Round to the nearest whole number, if necessary.)
A. 17 new cases B. 69 new cases C. 138 new cases D. 34 new cases
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 = 12 when 
If necessary, round the answer to the nearest tenth of a second.
A. 1.6 sec B. 2.2 sec C. 0.4 sec D. 1.3 sec