Identify the row operation that produces the resulting matrix.  ? 

A. R1 + R2 ? R1
B. R1 + R2 ? R1
C. R1 + R2 ? R2
D. R1 + R2 ? R2

Answer: C

Mathematics

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A. 1, 2, 3, 4, 5 B. 1, 3, 5, 7, 9 C. 3, 5, 7, 9, 11 D. -1, -3, -5, -7, -9

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Add or subtract as indicated. Simplify, if necessary. - 

A. - 
B. - 
C.
D.

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Solve the problem.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 ft from a light is 3 foot candles, find the intensity on a screen 20 ft from the light.

A.  foot-candle
B.  foot-candle
C. 1 foot-candles
D. 2 foot-candles

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Use a graphing utility to graph the inequality.2x + y - 3 ? 0

A.

B.

C.

D.

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