Solve the problem.Suppose a cost-benefit model is given by y = 
, where y is the cost in thousands of dollars for removing x percent of a given pollutant. Find the cost of removing 90%.
A. $7380
B. $8999
C. $8200
D. $73,799
Answer: D
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (9 sin 2t)i - (8 cos 2t)j + (9 csc 2t)k
A. a
= -36i - 36k
B. a
= -36i + 36k
C. a
= 36i + 36k
D. a
= 32j + 36k
Mathematics
Evaluate the factorial expression.
A. 1 B. 7 C. 42 D. 210
Mathematics
Determine whether the statements are logically equivalent.~(~p ? q), p ? ~q
A. Equivalent B. Not equivalent
Mathematics
Solve the equation.
+ 
= 
A. 4 , -1 B. -4, 1 C. 1 D. 4 , 1
Mathematics