Find the length of the curve r(t) = 2ti+t²j+1ntk, 1?t?e³.
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Solve the quadratic inequality.
> 4
A. x < -5, -3 < x < 4, x > 4 B. x < -4, -4 < x < 3, x > 5 C. x < -4, -3 < x < 4, x > 5 D. x < -5, -4 < x < 3, x > 4
Simplify.26 + 23 ÷ (-2)
A. -10,976.000 B. 22 C. -17.000 D. 30
Using a dot product, calculate the work done in the given situation.A 165-pound person climbs 5 steps up a ladder that has rungs spaced at one-foot intervals. The ladder is inclined at an angle of 74° relative to the ground.
A. 793 ft-lb B. 825 ft-lb C. 227.4 ft-lb D. No work is done
Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 25 ft and the vertical clearance must be 20 ft at a point 18 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1