Math, asked by sowndarya92, 10 months ago

d=5 s9= 75 a=? a9= ?

Answers

Answered by manjulachilakandi

5

Answer:

sn=n/2(2a+(n-1)d

Step-by-step explanation:

75=9/2(2a+(9-1)5. 75=9/2(2a+40). 75=9(a+20). 75/9=a+20. 25/3-20=a. a=85/3. A9=a+8d. 85/3+40=205/3

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