which of the following sets of lengths could not be the side lengths of a triangle?

3 ,5 ,7

1 ,1.25 ,1.5

5, 10.5, 17

15, 18, 30

Which of the following sets of lengths could not be the side lengths of a triangle?

3 ,5 ,7

1 ,1.25 ,1.5

5, 10.5, 17

15, 18, 30

Step-by-step explanation:

(9, -3)

Step-by-step explanation:

The coordinates of the midpoint are the averages of the coordinates of the endpoints.

For the x coordinates:

3 = (-3 + x) / 2

x = 9

For the y coordinates:

3 = (9 + y) / 2

y = -3

The other endpoint is at (9, -3)