Find the curvature of the space curve.r(t) = 
(1 + t)3/2i +
(1 - t)3/2j + 
tk
A. ? = 
B. ? = 
C. ? = 
D. ? = 
Answer: B
Mathematics
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Find the margin of error for the survey results described. In a survey of 257 adults, 35% said that they had tried acupuncture at some point in their lives.Give your answer as a decimal to three decimal places.
A. 0.004 B. 0.062 C. 0.125 D. 0.031
Mathematics
Evaluate f(x) at the given value of x by hand. f(x) = 
; x = 3
A. 
B. 
C. - 
D. 
Mathematics
Solve the problem.Last year, Maria earned $375 per week. This year, her salary increased to 
per week. What is the percent of increase?
A. 6.7% B. 92.8% C. 93.3% D. 7.2%
Mathematics
Solve.In one week, Manisha worked 30.25 hours walking dogs and earned $259.25, including tips. How much did Manisha earn per hour? Round to the nearest cent if necessary.
A. $8.57 B. $8.55 C. $8.67 D. $8.59
Mathematics