aljanahi2 aljanahi2

25-06-2020
Mathematics

contestada

The sum of the first 10 terms of the arithmetic series for which a1 =
is
180, a2 =
150, and a3 = 120

Respuesta :

09pqr4sT 09pqr4sT

25-06-2020

Answer:

[tex]450[/tex]

Step-by-step explanation:

[tex]a_1=180\\a_2=150\\a_3=120[/tex]

[tex]d=-30[/tex]

[tex]a_n=-30n+210[/tex]

[tex]a_4=90\\a_5=60\\a_6=30\\a_7=0\\a_8=-30\\a_9=-60\\a_{10}=-90[/tex]

[tex]180+150+120+90+60+30+0-30-60-90=450[/tex]

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