Answers

2016-06-25T12:45:05+08:00
2,600 is the sum

start by adding the first 10 multiples of it which by the way is in the  multiplication  table  8x1,8x2,8x3,8x4,8x5,8x6,8x7,8x8,8x9,8x10. then from 80 start adding 8  up until 200 which is the 25th multiple of 8
1 3 1
  • Brainly User
2016-06-26T01:29:24+08:00
The formula of sum of arithmetic series given the first term and common difference and the number of term.

S _{n} = n/2 [ 2(a₁) + (n-1) (d)]

a₁ = 8    n = 25      d = 8

S _{n} = 25/2 [ 2(8) + (25-1)(8)]

S₂₅ = 25/2 [16 + (24)(8) ]

S₂₅ = 25/2 [16 + 192]

S₂₅ = 25/2 (208)

S₂₅ = 25 (104)

S₂₅ = 2,600     ANSWER


You can use the formula to find the sum of 50, 100, 350 multiples or terms.
2 4 2