Prime numbers are numbers that are only divisible by 1 and themselves. So, to tell if a number is prime, look at its factors.
19:
1 x 19
29:
1 x 29
39:
1 x 39
3 x 13
So, because 39 has more than one set of factors, it's NOT a prime number.
D,working backwards cause u work faster backwards
Answer:
compassionate because you are doing something that makes you feel good inside and you get the urge that you have to do it for someone else
Answer:
reliable, valid
Explanation:
Reliability and validity are concepts in measurement. Reliability has to do with the degree to which an instrument can produce consistent results when it is used repeatedly over time. Validity, on the other hand, indicates the extent to which the instrument measures its intended measurement. The scale can be reliable but not value as it still produces results, though inaccurate.
