There are 5 sections in total.
She colored 2 sections out of the 5 sections.
As a fraction, that would be 2/5, which is 0.4 as a decimal (2 divided by 5), which is 40%
The circumference of a DVD disc is 28.26 cm
A direct variation has a constant slope, i.e. (y/x)= constant.
Both of the given two points give a slope of (y/x)=14/2=28/4=7, so the equation of the function is
y/x=7, or simply
y=7x