Provide an appropriate response.The simple interest for an account is jointly proportional to the time and principal. The quarterly interest for an account balance of $6,000 is $82.50. Find the interest on a balance of $25,000 for 9 months.

A. $3,381.82
B. $1,031.25
C. $1,833.33
D. $2,800


Answer: B

Mathematics

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A patient's skull is x-rayed from a distance (FFD) of 18cm and an exposure time of 0.3s. If a second x-ray is ordered at a distance of 30cm, what should the exposure time be assuming the current setting is not changed?

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Find the difference and simplify the answer.  - 

A.
B.
C.
D.

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