find the sum of the first multiples of 8
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0
Answer:
The sum of the first 15 multiples of 8 is 960.
Step-by-step explanation:
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Answered by
0
Answer:
288
Step-by-step explanation:
a=8. d=8. n=8
S = n/2 [2a+(n-1)d]
= 8/2 [ 16 +(8-1)8]
= 4 [16 + 7×8]
= 4 × (16 + 56 )
= 4 × 72
= 288
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