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:
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The answer is B
If you move the decimal to two digits to the right, you will get 98.345.
1160 dollars if you take 5/6 away from 1200 you get 40 subtract 40 from 1200 and you get your answer
It is 5 you just have to count