given s=n/2[2a+(n-1)d], find d when s=800,n =16 and a=5
Answers
Answered by
2
Answer:
800=8[10+15d]
100=10+15d
15d=90
d=6
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Step-by-step explanation:
Answered by
1
Answer:
S=800
n=16
a=5
Using sum formula
S=n/2[2a+(n-1)d]
800=16/2[2×5+(16-1)d]
800=8[10+15d]
100=10+15d
15d=100-10
d=90/15
d=6
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