Math, asked by sowndarya92, 9 months ago

d=5 s9= 75 a=? a9= ?​

Answers

Answered by sonusuni9980
6

a=1/4

a9=4.25

Sn=n/2[2a+(n-1)d]

9=9/2[2×a+(9-1)5]

9=18/2a[8×5]

9=9a[40]

9=36a

a=9/36

a=1/4

an=a+(n-1)d

1/4+(9-1)5

1/4+(8×5)

1/4+40

1+160/4

161/4

a9=4.25

hope may help you

thank you ☺️

Answered by zohra98290
0

Answer:

Step-by-step explanation:

d=5,s

9

=75

s

9

=

2

9

[2a+(9−1)5]

75=

2

9

[2a+40]

150=9[2a+40]

150=18a+360

150−360=18a

−210=18a

18

−210

=a

a=

3

−35

a

9

=a+(9−1)5

a

9

=

3

−35

+40

a

9

=

3

−35+120

a

9

=

3

−85

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