Solve the formula for the specified variable.

A = P + PRT for R

To solve the formula for R, we need to isolate R on one side of the equation.

A = P + PRT

First, subtract P from both sides of the equation:

A - P = PRT

Next, divide both sides of the equation by PT:

(A - P)/(PT) = R

Therefore, the formula for R is:

R = (A - P)/(PT)

To solve for R in the formula A = P + PRT, we can follow these steps:

Step 1: Start with the formula A = P + PRT.

Step 2: Subtract P from both sides of the equation to isolate the term PRT. This gives us A - P = PRT.

Step 3: Divide both sides of the equation by PT to solve for R. This gives us (A - P) / PT = R.

Therefore, the formula for R in terms of A, P, and T is R = (A - P) / PT.