Question 170506
remember when a constant like x in our case varies directly with another variable,s squared in our case  it takes on this form {{{x/s^2=k}}} and when a constant like x varies indirectly with t it takes on this form xt=k
: together we have xt/s^2=k or {{{x=s^2(k)/t}}}
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so we have when s is doubled we have {{{xt/(2s)^2=k}}} or {{{x=4s^2(k)/t)}}}meaning x increases by 4 when s is doubled.
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when s and t are doubled  we have {{{x(2t)/(2s)^2)=k}}}or {{{x=2s^2(k)/t}}}
meaning x doubles when s and t are doubled