Solve the problem.The energy E (measured in joules) released by an earthquake of magnitude M on the Richter scale 
is given by the equation 
. Suppose an earthquake registers 7 on the Richter scale. Let I0 = 1. What is the intensity of the earthquake?
A. I = 1014.9
B. I = 107
C. I = 14.910
D. I = 710
Answer: B
Mathematics
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Solve the equation.
= 
A. -2, 6 B. 0, - 3 C. No solution D. 0, 36
Mathematics
Find the inverse of the matrix.
a. 
b. 
c. 
d. 
e. 
Mathematics
Solve the proportion problem.A photograph measuring 2 inches by 3.8 inches is enlarged to increase the original 2-inch dimension to 5 inches. When this is done, how long does the original 3.8-inch dimension become? (Round your answer to the nearest tenth, if necessary.)
A. 10 in. B. 1.3 in. C. 9.5 in. D. 2.6 in.
Mathematics
Solve.2x2 - 3y2 = -304x2 + 3y2 = 84
A. (-3, -4), (-4, -3) B. (3, -4), (3, 4) C. (3, 4), (4, 3), (-3, -4), (-4, -3) D. (3, 4), (-3, 4), (3, -4), (-3, -4)
Mathematics