Find the unit tangent vector of the given curve.r(t) = 
i + 
j - 12tk
A. T = 
i + 
j - 
k
B. T = 
i + 
j - 
k
C. T = 
i + 
j - 
k
D. T = 
i + 
j - 
k
Answer: C
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Choose the equation that matches the graph.
A. x2 = -8y B. x2 = 8y C. 8x2 = y D. y2 = 8x
You start with an investment of $1440.09. The first year the investment grows by 7%. The second year the investment declines by 7%. What is the value of the investment at the end of the two-year period? Round your answer to the nearest cent. ?
A. $1,440.09 B. $1,433.03 C. $0.00 D. None of the above
Find the indicated probability.You roll two fair dice. Let E be the event that an even total shows on the dice. Let F be the event that a two shows on at least one of the dice. Find P(F) and P(F?E).
A. P(F) = 
, P(F?E) = 
B. P(F) = 
, P(F?E) = 
C. P(F) = 
, P(F?E) = 
D. P(F) = 
, P(F?E) = 
What number should be added to complete the square of the expression?x2 - 18x
A. 81 B. 162 C. 41 D. -9