Ongueleamaeidn
Answered

Tuklasin kung paano ka matutulungan ng IDNStudy.com na makuha ang mga sagot na kailangan mo. Ang aming komunidad ay narito upang magbigay ng detalyadong sagot sa lahat ng iyong mga katanungan.

1.find the twelfth element of an arithmetic sequence whose first term is 2 and second term element is 5?

2.find the first element of an arithmetic sequence whose eight element is 2 and common difference is -2?

Sagot :

Jeremiaidn

[tex] t_{1} [/tex]
1.) Cannot be determined because an arithmetic sequence has to have 3 given terms, the given example has only 2.

2.) Arithmetic sequence formula:

[tex] t_{n} [/tex] = [tex] t_{1} [/tex] + (n-1)d

[tex] t_{8} [/tex] = [tex] t_{1} [/tex] + (8-1)-2

2 = [tex] t_{1} [/tex] + (7)-2

2 = [tex] t_{1} [/tex] + -14

2 + 14 = [tex] t_{1} [/tex] + -14 + 14

16      = [tex] t_{1} [/tex] + 0

16 = [tex] t_{1} [/tex] = 1st term


Answer: 16