Question

pliz solve this answer ​

Answer 1

Answer:

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Answer 2

Answer:

first term = 5

and the last term = 45 = an

s = n/2 ( a + an )

400 = n/2 ( 5 + 45 )

400 = n/2 x 50

400 = n x 25

n = 400/25

n = 16...

an = a + ( n - 1 )d

45 = 5 + (16 - 1 ) d

45 - 5 = 15d

15d = 40

d = 40/15

d = 8/3

so, the ap is 5,23/3, 31/3.......