# Double posting ... nevertheless help for #1

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Posted by SUBHOTOSH KHAN on September 29, 2002 at 16:52:43:

In Reply to: calculus! help! posted by M.Shugarts on September 29, 2002 at 16:20:41:

:
: I'm in great need of some help. It's a word problem

: 11. The gross national product (GNP) of a certain country is N(t)= t^2+3t+121 billion dollars t years after 1990. At what percentage rate will the GNP be changing with respect to thime in 1995?

: and

: 12) If the total cost of manufacturing q units of a certain commodity is C(q)= (3q+1)(5q+7), use marginal analysis to estimate the cost of producting the 19th unit.

: and

: Find the derivative if Y= (3x^5-7x+5)(x^3+x-a)

:
: and help would be appreciated.
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N(t)= t^2+3t+121

Steps:

1) find N'(t)

2) replace t by 5 (=1995-1990)

3) find N(t) for T = 5

4) dIVIDE (2) BY (3) TO GET % CHANGE

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