Asked by Marie Pierre

Given the table with values for A and r, answer the folowing:
r 2 3 4 5
A 12.57 11.31 50.28 78.56

a. What equation represtnts the relationship of the values in the table above?
b. Find the constant of variation.
c. If r = 8, what would be A?
Answered by Reiny
Not enough data to see a pattern
http://www.wolframalpha.com/input/?i=plot+%282%2C12.57%29%2C+%283%2C11.31%29+%2C+%284%2C50.28%29%2C+%285%2C78.56%29
Answered by Marie Pierre
yes, i know. that is why i also had a hard time. but this is what is written in our textbook. oh well! i don't know what to do now. :)
Answered by Reiny
What is the topic for this question?

Are you learning about "curve fitting" ?
Answered by Marie Pierre
nope. we are learning about variations. i think with this problem, it involves direct square variation. but the problem is, i get a different answer when r=3 and A=11.31 from the rest. is that possible?
Answered by Reiny
A direct square variation is a quadratic
Given any 3 points , I can find that quadratic, but we can't "force" a fourth point on it.

e.g
A = 20.115r^2 - 101.835r + 135.78

produces the first 3 points , but not the last one
Answered by Anonymous
the formula h=-16t^2 48t 160 given the height of an object thrown from a building 160 feet high with an initial speed of 48 ft/sec where t is measured in seconds find the time for the object to hit the ground and find the maximum height of the object
Answered by Marie Pierre
oh ok. thanks reiny. :)
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