Question

Asnwer below with all working

Answer 1

this is sn arithmetic sequence where d=3; s1=4; n=no. of steps

sñ=s+(n-1)d

s5=4+(5-1)3

s5=4+(4×3)

s5=4+12

s5=16

s6=4+(5×3)

s6=19

b. sñ=s+(n-1)d

c. s23=4+(23-1)3

s23=4+(22×3)

s23=70