Solve the equation for the specified variable. P=A/1+rt for r.

R=[ (-1) (A/1) ]-t+P > explanation > P = (A/1) + rt > subtract "r" from both sides to

get > P-r = (A/1) + t > then subtract "P" from both sides to get > - r = (A/1) + t-P >

then multiply the whole equation by "-1" to make "r" positive > (-1) {-r = (A/1) + t-P}

> r=[ (-1) (A/1) ]-t+P ... if this was not the answer then I'm sorry ... <3