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Posted by Subhotosh Khan on August 29, 2002 at 07:14:07:

In Reply to: pre-calc problems..urgent please posted by moon on August 28, 2002 at 18:56:55:

: hi..i'm trying to do these problems...i don't know how to go out these because the teacher did not go over them in class. i would appreciate if somebody could help me here or email me. here they are:

: Express the area of a circle as a function of its a) diameter b) circumference. Show all work. Explain how each formula works.

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You know Area of circle:

A = pi * (radius)^2 .........(1)

We needto replace radius by diameter or perimeter. So we need to find relation between those and the radius.

We know:

So use (2) and (3) in (1) to replace 'radius' and get your expression.

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This part does not make sense.

What is the question????!!

: p(t)= 19.247+ 1.694t -6< t < -1
: (there's suppose to be line underneath both < )

: 19.305+0.427t+0.033t2
: ( suppose to be t squared) 0: (same thing, line under < )

: p(t) represents the average price of a mobile home.

: i need a somewhat quick response if anybody can...thanks

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