IDNStudy.com, ang iyong destinasyon para sa mabilis at eksaktong mga sagot. Magtanong at makakuha ng detalyadong sagot mula sa aming komunidad ng mga eksperto na may kaalaman.

Find the sum of the first 15 terms of the arithmetic sequence: 10, 15, 20, 25, … ? Find the sum of the first 11 terms of the arithmetic sequence: −4, 3, 10, 17, … ?​

Sagot :

ᗩᑎՏᗯᗴᖇ:

a) 10, 15, 20, 25, ...30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80

The 15th term is 80.

b) -4, 3, 10, 17, ...24, 31, 38, 45, 52, 59, 66

The 11th term is 66.