A patient's forearm is x-rayed from a distance (FFD) of 45cm with the current level set at 100mA. If a second x-ray is to be taken using the same time exposure as the first but with the current level set at 50mA, what distance should be used?
A. 32cm
B. 23cm
C. 90cm
D. 15cm
Answer: A
Mathematics
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D. 
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An ordered pair is a(n) 
of an equation in two variables if replacing the variables by the coordinates of the ordered pair results in a true statement.
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3
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