Ineed on how to solve ( x2-5x-12) ÷ (x+3)

Which of these tables represents a non-linear function?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

A. 530 ft^2 b. 500 ft^2 c. 470 ft^2 d. 450 ft^2