Question

find value of S40-S30 for sequence 4,8,12,16........​

Answer 1

Answer:

40

Step-by-step explanation:

First term, a1 =4

Second term, a2=8

Common difference, d=a2- a1

d=8−4=4

∴ The common difference is 4.

s40=s1+s39=4+160=164

s30=s1+s29=4+120=124

s40-s30= 164-124=40

Answer 2

Step-by-step explanation:

see the answer in attachment