Can the sides of a triangle have lengths 2,6, 9?

No

Step-by-step explanation:

Using the Pythagorean theorem,  a squared + b squared = c squared, where c is the hypotenuse. 2 squared is 4, 6 squared is 36. 4+36 is 40, but 9's square is 81. This means that it can't be a triangle.

Hope this helps :)

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.