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

asked May 8, 2021 168k views

3 votes

The sum of the first 10 terms of the arithmetic series for which a1 =

is
180, a2 =
150, and a3 = 120

5.1k points

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1 vote

Answer:

450

Explanation:

$a_1=180\\a_2=150\\a_3=120$

d=-30

a_n=-30n+210

$a_4=90\\a_5=60\\a_6=30\\a_7=0\\a_8=-30\\a_9=-60\\a_(10)=-90$

180+150+120+90+60+30+0-30-60-90=450

Arianna answered May 12, 2021

4.9k points

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