Solve the problem.The half-life of plutonium-234 is 9 hours. If 10 milligrams is present now, how much will be present in 2 days? (Round your answer to three decimal places.)
A. 8.572
B. 6.91
C. 0.248
D. 2.143
Answer: C
Mathematics
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Find the inverse of the matrix. 
A. 
B. 
C. 
D. 
Mathematics
Find the indefinite integral of the following function and check the result by differentiation.
?
?
A. 
B. 
C. 
D. 
E. none of the above
Mathematics
Find the width of the river in the illustration. Round your answer to the appropriate number of significant digits.
A. 113 m B. 108 m C. 105 m D. 115 m E. 112 m
Mathematics
Factor completely by trial and error. If prime, so state.
A. (x + 9)(x - 7) B. (x - 9)(x + 7) C. (x - 9)(x - 7) D. (x + 9)(x + 7)
Mathematics