2x/3=8
2x=24
x=12
It takes Molly 12 minues to run one mile.
Answer:
n=-1
Step-by-step explanation:
43/-43=-1
Solving for a variable in an equation means, we are changing the subject of formula of the equation.
The equation of r is: 
The equation is given as:

We start by multiplying both sides by 3

Rewrite as:

Divide both sides by 

Cancel out common factors

Take square roots of both sides

Evaluate the right-hand sides

Make r the subject

Hence, the resulting equating for r is:

Read more about the subject of formulas at:
brainly.com/question/21866313
Answer:
11.7
Step-by-step explanation:
A^2+b^2=c^2
x^2+15^2=19^2