Solve.If an earthquake measured 
on the Richter scale, what was the approximate intensity of the earthquake in terms of I0? The magnitude on the Richter scale of an earthquake of intensity I is 
A. 1,300,000 ? I0
B. 450 ? I0
C. 1,000,000.0 ? I0
D. 130,000 ? I0
Answer: A
Mathematics
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Provide an appropriate response.Under what condition is this statement true for all x and y? 
Fill in the blank(s) with the appropriate word(s).
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In the figure ACDF is a parallelogram and AD and BE bisect each other. Prove that BC ? FE.
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Add and subtract as indicated. Simplify and leave the numerator and denominator in your answer in factored form.
+ 
A. 
B. 
C. 
D. 
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Find the first term a1 and the common difference d of the arithmetic sequence.-3, 3, 9, 15, 21, . . .
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Mathematics