Jamieandej Jamieandej

30-01-2020
Mathematics

contestada

Find the sum of the first 25 terms of the arithmetic sequence.
[tex]a_1=100\:and\:a_{25}=220[/tex]

Respuesta :

devishri1977 devishri1977

30-01-2020

Answer:

Step-by-step explanation:

[tex]\frac{n}{2}*(a+l)=\frac{25}{2}*(100+220)\\\\=\frac{25}{2}*320=\frac{25*320}{2}\\\\=25*160=4000[/tex]

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