Evaluate the piecewise-defined function at the indicated value. f(x) = {
; f(-1)
A. -2
B. 8
C. -8
D. -4
Answer: C
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Find the magnitude of u × v and the unit vector parallel to u × v in the direction of u × v.u = 2i + 2j - k, v = -i + k
A. 3; 
i + 
j - 
k
B. 3; 
i - 
j + 
k
C. 9; 
i - 
j + 
k
D. 9; 
i + 
j - 
k
Solve the problem.Within a group of n people, the number of possible handshakes, N, is given by 
How many handshakes are possible at a meeting if 24 people are present?
A. 552 handshakes B. 276 handshakes C. 264 handshakes D. 300 handshakes
Answer the question.Which of the following is NOT listed as a suggestion to follow when preparing for an exam?
A. Reread the sections in the textbook that will be covered on the exam. B. Revisit your homework and the chapter review problems. C. Relax, and work on the exam thoughtfully. D. Test yourself.
Solve the problem.Body-mass index, or BMI, takes both weight and height into account when assessing whether an individual is underweight or overweight. BMI varies directly as one's weight, in pounds, and inversely as the square of one's height, in inches. In adults, normal values for the BMI are between 20 and 25. A person who weighs 189 pounds and is 69 inches tall has a BMI of 27.91. What is the BMI, to the nearest tenth, for a person who weighs 138 pounds and who is 65 inches tall?
A. 23.4 B. 23 C. 22.5 D. 22.2