Question

d=5,s9=75,find a and a9​

Answer 1

Answer:

d=5,s9=75

s9= 9/2 [2a+(9−1)5]

75= 9/2 [2a+40]

150=9[2a+40]

150=18a+360

150−360=18a

−210=18a

-210/18 =a

a= -35/3

a9 =a+(9−1)5

a9 = −35/3 + 40

a9 =-35 + 120

3

a9 = -85/3

Step-by-step explanation:

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Answer 2

Answer:

the answer is given above

Step-by-step explanation:

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