Which description is paired with its correct expression? 7
seven less than the quotient of two and a number squared, increased by six;
2
+6
n
O nine times the difference of a number cubed and three; 9(n°-3)
O eight more than the quotient of a number squared and four, decreased by seven;
8+
4
- 7
n?
O twice the difference of a number cubed and eight; 272-8
Hi

a is the right answer

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.