Find an equation of the tangent line to the graph of 
at its inflection point.
?
A. 
B. 
C. 
D. 
E. 
Answer: E
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A rectangular box is to have a square base and a volume of 4 ft.3. If the material for the base costs 20 cent/square foot, the material for the sides costs 30 cent/square foot, and the material for the top costs 10 cent/square foot, determine the dimensions of the box that can be constructed at minimum cost.
?
?
A. 
B. ?
C. ?
D. ?
Determine whether the given ordered pair is a solution of the system.(-1, -3)4x - y = -72x + 4y = -14
A. solution B. not a solution
Solve each problem.The velocity of a particle (in ft/s) is given by 
where t is the time (in seconds) for which it has traveled. Find the time at which the velocity is at a minimum.
A. 6 s B. 1 s C. 2 s D. 3 s
Perform the indicated operation.
- 4
A. 12 - 20
B. 16 - 20
C. -16
D. -1