Find the unit tangent vector  for the line tangent to the space curve  at point

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?



A.
B. ?
C. ?
D. ?
E. ?

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Answer: D

Mathematics

If an average-sized man falls with a parachute, then his velocity , in feet per second, t seconds into the fall is given by . ? During which period will his velocity be between 9.99 and 12.99 feet per second? Round to two decimal places.                

A. From 0.65 seconds on B. From 9.77 seconds on C. From 0.43 to 0.65 seconds into the fall D. From 4.88 to 9.77 seconds into the fall

Determine ? in decimal degrees, 0° ? ? ? 90°. Round results to an appropriate number of significant digits.csc ? = 1.6

A. 38.7° B. 34.0° C. 39° D. 34°

Perform the division.

A. x2 - 25 B. x2 - 25x + 5 C. x2 + 5x + 5 D. x2 + 25

Perform the indicated operations.(10x2 + 6x + 10) - (-3x2 - 6)

A. 7x2 + 12x + 10 B. 7x2 + 6x + 4 C. 13x2 + 12x + 10 D. 13x2 + 6x + 16