Which of the following is not a method used by scientists to determine the age of ancient remains? a. dna testing b. carbon dating c. primary source documentation d. dendrochronology

A. DNA testing

Explanation:

A genealogical test of DNA consists in examining the genome of a person, by taking a sample of specific components. The results provide information about genealogy (family history) or personal lineage. In general, these tests allow comparing the data obtained from an individual with others of the same lineage or current and historical ethnic groups.The results of the tests are not for medical use, for which different types of genetic tests are needed. These do not determine specific genetic diseases or disorders. Its objective is only to gather genealogical information

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69