$653.84 would be a week's salary if no taxes are figured into the equation
For this case we have that by definition, the Pythagorean theorem states that:

Where:
a, b: Are the legs
c: It is the hypotenuse
According to the figure we have to:

Substituting in the formula we have:

Answer:
Option D
There is no local extremas but here is the objective function graphed
R'S' is equal in length to RS.
length doesnt change, it was just rotated.