How do you solve $A = P + Prt$ for r?

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Answer 1 · 2016-06-19T19:42:44

$r = (A - P)/(Pt)$

Solve for r, means make r the subject of the formula, write r in terms of all the other variables.

$P + color(blue)(Prt) = A$

$" "color(blue)(Prt) = A - P " isolate the term which contains " r$

$" "Pcolor(red)(r)t = A - P$

$" "color(red)(r) = (A - P)/(Pt) " to isolate " r$ divide by $P and t$

How do you solve A = P + PrtA = P + Prt for r?