Pandora2016
Pandora2016 Pandora2016
  • 04-09-2016
  • Mathematics
contestada

Find the sum of a finite arithmetic sequence from n = 1 to n = 10, using the expression 3n − 8.

56

85

54

116

Respuesta :

caylus
caylus caylus
  • 04-09-2016
Hello,

[tex]\sum_{i=1}^{10}\ (3*i-8)\\ =3*(\sum_{i=1}^{10}\ i )-8*10\\ =3*(1+10)*10/2 -80\\ =165-80=85[/tex]

Answer B
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meerkat18
meerkat18 meerkat18
  • 09-09-2016
we are given the function 3n - 8 and is asked in the problem to determine the sum of the terms in which n is from 1 to n is equal to 10. In this case, we substitute each number to the function and add their values. The answer to this problem therefore is 85.
Answer Link

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