Question

Solve the formula for the specified variable
A=p+prt solve for r

Answer 1

r=A-p (the line is the bar so this is a-p over pt)

pt

Explanation:

P + Prt = A

P r t=A −P isolate the term which contains r

P rt=A−P

divide pt by each side

Answer 2

Explanation:

The first step is to take p on both sides:

`A - p = p + p*r*t - p`

On the right hand side, cancel p and -p, since
`p-p=0`. The equation will be:

`A - p = p*r*t`

Then, divide both sides of the equation by p*t:

`(A-p)/(p*t) = (p*r*t)/(p*t)`

On the right hand side, p*t can be cancelled:

`(A-p)/(p*t) = r`