Solve the equation.
+ 
= 4
A. {-3}
B. 
C. {3}
D. ?
Answer: B
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The base of a 52-ft ladder leaning against a wall begins to slide away from the wall. At the instant of time when the base is 48 ft from the wall, the base is moving at the rate of 9 ft/sec. ? How fast is the top of the ladder sliding down the wall at that instant of time? ?
A. 20.9 ft/sec B. 21.6 ft/sec C. 26.5 ft/sec D. 17.2 ft/sec
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Fill in the blank(s) with the appropriate word(s).