Which of the following is not an example of a quadratic inequality?

Solve for x and y a x= 13.3 y= 16.7 b x= 23.3 y= 12.5 c x= 7.5 y= 16.7 d x=7.5 y= 12.5

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Ineed with math stuff it involves graphs