Equilateral: 3
scalene: 5
isosceles: 1, 2, 4
The formula to calculate the distance between two points is given by

In this problem, we have the coordinates
(4, -1) and (9, 7)
substitute in the formula

<h2>The answer is 9.43 units</h2>
A.) The mean of the 8th and 9th values