Solve the problem.
Three boards are used as shelves in a bookcase. Each one is 1
inches thick and the shelves areevenly spaced. If the height, h, of the bookcase is 42 inches, how much space is between each shelf?
A. 21 inches
B. 14 inches
C. 13 inches
D. 18
inches
Answer: D
Mathematics
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Find the surface area of the circular solid. Unless otherwise specified, use 3.14 for ? and round your answer to the nearest tenth.A sphere with d = 6.4 yd
A. 6.4 yd2 B. 128.8 yd2 C. 137.2 yd2 D. 32.2 yd2
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Find the length of the indicated portion of the trajectory.r(t) = (2cos t)i + (2sin t)j + 7tk, 0 ? t ? ?/2
A. 
?
B. 
?
C. 
?
D. 
?
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Provide an appropriate response.Determine the value(s) that must be excluded as possible solutions to the rational equation: 
Fill in the blank(s) with the appropriate word(s).
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Solve.r(r - 14) = -49
A. 49, 7 B. 7 C. -7 D. -7, 7
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