A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 
. Find this earthquake's magnitude.
?
A. M = 3.8
B. M = 7.8
C. M = 6.5
D. M = 7.1
E. M = 8.7
Answer: B
Mathematics
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A. 
B. 
C. 
D. 6m6
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A. - 
B. 
C. 
D. - 
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Solve the system.
a. y = 3, y = 2
b. x = 2, y = 9
c. x = 1, y = 2
d. 
e. no solution
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Find the exact value of y, or state that y is undefined.y = sin-1 
A. - 
B. ?
C. 
D. 
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