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

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

asked
User Antenka
by
8.1k points

1 Answer

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

answered
User Arianna
by
8.2k points
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