A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 
. Find this earthquake's magnitude.
?
Please round your answer to the nearest tenth.
Fill in the blank(s) with the appropriate word(s).
8.5
Mathematics
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Determine whether the statement is a self-contradiction, an implication, a tautology (that is not also an implication), or none of these.~p ? (~p ? ~q)
A. Tautology B. Self-contradiction C. Implication D. None of these
Mathematics
Solve the problem.After a new firm starts in business, it finds that its rate of profits (in hundreds of dollars per year) after t years of operation is given by 
Find the profit in year 8 of the operation.
A. $64,000 B. $20,300 C. $57,050 D. $46,900
Mathematics
Evaluate the surface integral of G over the surface S.S is the plane x + y + z = 2 above the rectangle 0 ? x? 5 and 0 ? y ? 2; G(x, y, z) = 6z
A. - 90
B. 420
C. 180
D. -180
Mathematics
Evaluate.(-8)3
A. -24 B. -512 C. 512 D. 24
Mathematics