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MTH 280 Wk 7 – Final Exam

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MTH 280 Wk 7 – Final Exam

Question 1

A car starts from a point at 2:00 p.m. and travels north at 40 mph. Another car starts from the same point at 3:00 p.m. and travels west at 50 mph. After the second car has traveled 1 h, at what rate is the distance between the two cars changing?

 

 

 

 

 

 

 

 

 

 

Question 2

 

A spherical ball is measured to have a radius of 6 space c m with a possible measurement error of plus-or-minus 0.1 rm c m. Use the differentials to estimate the percentage error in computing the volume of the ball.

 

 

1%

 

 

3%

 

 

5%

 

 

10%

 

 

Question 3

 

A company determines a cost function of c equals 6 x squared minus 180 x plus 2000, where c is the cost (in dollars) of producing x number of items. How many items should the company manufacture to minimize the cost?

 

 

12

 

 

15

 

 

24

 

 

30

 

 

Question 4

 

The position of an object is given by the equation s left parenthesis t right parenthesis equals 2 x squared plus x minus 6. Find the time t at which the instantaneous velocity of the object equals the average velocity in the interval open square brackets 0 comma 3 close square brackets.

 

 

t equals 1.5 semicolon space s

 

 

t equals 3 semicolon space s

 

 

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