Help! (r varies jointly with s and t; r = 180 when...)

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oryanzmommy1

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Feb 8, 2006
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i ran into a problem and i couldnt get it...i was clue less...i dont know how the problem is suppose to be set up or anything...HELP!!! here is the problem it gives me...

Suppose r varies jointly with s and t, and r=180 when s=3 and t=12. Find r when s=8 and t=20
 
Re: clue less people HELP!!!

oryanzmommy1 said:
r varies jointly with s and t
Click to expand...
These words should ring in your head. Whenever you see them, don't even keep reading the problem. Stop! Write down "r = k*s*t". THEN go back and read the rest of the problem statement.
 
The next step is to find 'k', the "constant of proportionality". This can be done by substituting all the values given in the problem statement. It MUST give you a complete set.
 
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