All () numbers can be split into factor pairs.

A number that has only two factors, 1 and the number itself, is called a prime number. Any prime number will have only a single factor pair. Example: for the prime number 17: 17 × 1 = 17, therefore it has only one factor pair. All natural numbers are the product of at least one factor pair.

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.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225