Question 365007
{{{(E/e) = (R + r)/r}}}
{{{r(E/e) = R + r}}}
{{{r(E/e) -r= R }}}
{{{r((E/e)-1) = R }}}
{{{highlight(r=R/((E/e)-1)))}}}
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{{{A = P(1+in)}}}
{{{A/P=1+in}}}
{{{A/P-1=in}}}
{{{highlight(i=(1/n)(A/P-1))}}}
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{{{V1 = (V2 - n)/t}}}
{{{highlight(t = (V2 - n)/V1)}}}