What is the reason that ax is perpendicular to xc

The statement doesn't tell us why AX is perpendicular to XC, but we actually don't need to know that.  All we need to show is that if AX is perpendicular to XC, then is right.

Luckily, this is true because of the definition of perpendicular lines.  Two perpendicular lines form right angles, so if two perpendicular segments intersect, they form a right angle at their intersection.  So, if AX is perpendicular to XC, angle AXC is right.

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.

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step-by-step explanation: