Question

In an AP:
given d = 5, s9 = 75, find a and a9.​

Answer 1

Answer:

this is the answer dear

Step-by-step explanation:

hope it helps you

Answer 2

Answer:

d=5; Sn=75; n= 9

Step-by-step explanation:

Sņ= n/2(2a+(n-1)d)

Sn=9/2(2a+(9-1)5)

75=9/2(2a+40)

75×2/9=2a+40

50/3= 2a+40

50/3-40/1=2a

-70/3=2a

-70/3×2=a

-35/3=a

An=a+(n-1)d

A9=-35/3+(9-1)5

A9=-35/3+40/1

A9=-35+120/3

A9=85/3

a=-35/3;;;A9=85/3

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