Solve.To trim the edges of a rectangular table cloth, 60 feet of lace are needed. The length of the table cloth is exactly one-half its width. What are the dimensions of the table cloth?
A. length: 10 feet; width: 20 feet
B. length: 5 feet; width: 10 feet
C. length: 20 feet; width: 10 feet
D. length: 20 feet; width: 40 feet
Answer: A
Mathematics
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Find the second derivative of the function.r = 
(3 - ?)
A. 
= - 
- 1
B. 
= - 
- 1
C. 
= 
D. 
= 
- ?
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Write the first four terms of the binomial expansion.(3x + 2y)7
A. 823,543y + 6x6y2 + 5x5y3 + 4x4y4 B. 2187x7 + 10,206x6y + 20,412x5y2 + 22,680x4y3 C. 7x7 + 6x6y + 5x5y2 + 4x4y3 D. 2187x7 y + 10,206x6y2 + 20,412x5y3 + 22,680x4y4
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Divide.13,871 ÷ 16
A. 866 R 15 B. 866 R 11 C. 866 D. 15
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Solve.y varies jointly with x and w. If y = 24 when x = 8 and w = 3, find y when x = 7 and w = 2.
A. y = 16 B. y = 6 C. y = 21 D. y = 14
Mathematics