Question

1. 0.1r - 1 = 0.65

Explanation:

Step1: Isolate the variable term

Add 1 to both sides.
$0.1r - 1 + 1 = 0.65 + 1$
$0.1r = 1.65$

Step2: Solve for r

Divide both sides by 0.1.
$r = \frac{1.65}{0.1}$

Answer:

$r = 16.5$