Find the work done by F over the curve in the direction of increasing t.F = - 
i + 
j + 
k; C: r(t) = 
i + 
j + 4tk, 0 ? t ? 
A. W = 
+ 
?2
B. W = 
+ 
?2
C. W = 
+ 
?2
D. W = 
+ 
?2
Answer: D
Mathematics
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Find the center and radius of the circle with the given equation. (x - 1.7)2 + (y + 4.7)2 = 7
A. (1.7, -4.7); r = 
B. (1.7, -4.7); r = 7
C. (4.7, -1.7); r = 7
D. (4.7, -1.7); r = 
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A. -6 B. 94 C. -54 D. -729
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Decide whether the expression has been simplified correctly.x4 ? x2 = x6
A. Simplified correctly B. Not simplified correctly
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Find the area of the triangle. If necessary, round the answer to two decimal places. 
A. 101.49 B. 9.23 C. 25.37 D. 31.21
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