Solve.To trim the edges of a rectangular table cloth, 48 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: 8 ft; width: 16 ft
B. length: 16 ft; width: 8 ft
C. length: 4 ft; width: 8 ft
D. length: 16 ft; width: 32 ft
Answer: A
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Find the gradient field of the function.f(x, y, z) = ln (x8 + y3 + z3)
A. ?f = 
i + 
j + 
k
B. ?f = 
ln ( y3 + z3)i + 
ln (x8 + z3)j + 
ln ( x8 + y3)k
C. ?f = 
i + 
j + 
k
D. ?f = 
i + 
j + 
k
Answer the question.A researcher wishes to determine the percentage of voters in a town who favor stronger environmental laws. Which of the following would be the most representative sample?
A. A sample selected randomly from the phone book B. A random sample of college students C. A sample consisting of every 10th person leaving an organic food store D. A sample of listeners who call in to a radio talk show
Solve the problem using two linear equations in two variables and Cramer's rule.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 3% cement should he mix with 3 bags of 45% cement to produce a mix containing 10% cement?
A. 17 bags B. 18 bags C. 23 bags D. 15 bags
Solve the problem.Barbara earns $7.25 per hour. Find her gross pay for 35.5 hours.
A. $257.39 B. $257.38 C. $257.28 D. $257.48