luck6021 luck6021
  • 07-08-2018
  • Mathematics
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Algebra 2 urgent assistance.

Algebra 2 urgent assistance class=

Respuesta :

mathstudent55
mathstudent55 mathstudent55
  • 07-08-2018

[tex] 1 + 2 + 3 + ... + n = \dfrac{n(n + 1)}{2} [/tex]

7 + 14 + 21 + ... + 105 =

= 7(1 + 2 + 3 + ... + 15)

= 7(15)(16)/2

= 840

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