Question

which expression defines the given series for seven terms?
8+13+18+...

Answer 1

A: (2n+6)
B: (3n+5)
C: (n+8)
D: (5n+3)

Answer 2

arithmetic series :
Sn = n/2 (2*a1 + (n-1)d)

Answer 3

what the letter d mean

Answer 4

d = difference
but looks your options above asking for just the sequence, not for series

Answer 5

therefore use the formula :
an = a1 + (n-1)d

Answer 6

known a1 = 8, and
d = a2 - a1 = 13 - 8 = 5

so,
an = a1 + (n-1)d
an = 8 + (n-1)5
an = 8 + 5n - 5
an = 5n + 3

Answer 7

thanks

Answer 8

welcome