Perform the operation.15.9 - 4.251
A. 20.151
B. 11.749
C. -20.151
D. 11.649
Answer: D
Mathematics
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The radioactive substance neptunium -139 decays to 72.85% of its original amount after 28 hours. How long (to the nearest hour) would it take for 37% of the original neptunium to be present? ? __________ hours
Fill in the blank(s) with the appropriate word(s).
Mathematics
Solve the inequality.x2 + 6x ? 0
A. (-?, 0] or [6, ?) B. (-?, -6] or [0, ?) C. [-6, 0] D. [0, 6]
Mathematics
Simplify by removing a factor equal to 1.
A. 
B. 
C. 
D. 2x + 5
Mathematics
Solve the equation.12x + 21 = 5x + 56
A. 5 B. -5 C. -8 D. 8
Mathematics