👤
Answered

find the sum of the first 8 terms in the arithmetic sequence of -11,-4,3,...​

Sagot :

Lexter0115go

Answer:

108

Step-by-step explanation:

Get the common difference(d)

d=(-4)-(-11)=7

d=3-(-4)=7

d=7

Complete the sequence

-11,-4,3,10,17,24,31,38,...

Add them.

(-11)+(-4)+(3)+(10)+(17)+(24)+(31)+(38)=?

(-15)+3+10+17+24+31+38=?

(-12)+10+17+24+31+38=?

(-2)+17+24+31+38=?

15+24+31+38=?

39+31+38=?

70+38=108

Go Training: Other Questions