<PRE><B>Question 1137780</B>
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T varies jointly as r and B squared. When r=7 and B=6, T=1008. Find T when r is 10 and 8 is 12. 
(T=4rB squared is not it) 
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{{{T=k*r*B^2}}}------------this is what the first sentence means, using k as variation constant.



{{{k=T/(rB^2)}}}


{{{k=1008/(7*6^2)}}}


{{{k=4}}}-----------the value for k, using the given data.


{{{highlight(highlight(T=4rB^2))}}}
This is the formula you need.







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Did you really have r squared AND B squared ?   If you did, then now you know what to do.
(Best bet that r is not squared.)
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