mrtheboss2221456
mrtheboss2221456 mrtheboss2221456
  • 23-04-2022
  • Mathematics
contestada

I need this done quick.

I need this done quick class=

Respuesta :

nfeinglass910
nfeinglass910 nfeinglass910
  • 23-04-2022
Answer:
460

Steps:
The Arithmetic Series formula is:
S = n( (a1 + an) / 2)

Take note that:

S = the sum of n terms
n = number of terms
a1 = the first term
an = the last term

We are given n, a1, an. Let’s solve for S.

S = 20( (18 + 28) / 2)
18 + 28 = 46
46 / 2 = 23
20 * 23 = 460
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