i don't even trust myself but all i can think of is this:
A = P + Prt
-P -P
A - P = Prt
------ ------
Pt Pt
r = A - P
-------
Pt
Answer:
r = (A-P) x (Pt)
Step-by-step explanation:
Solve for r, means make r the subject of the formula, write r in terms of all the other variables.
P+Prt= A
Prt=A-P
r=(A-P) x (Pt)
