If A100 = 100 And A90 = 110, What Is D?

If a100 = 100 and a90 = 110, what is d?

ANSWER :

The value for d is -1.

STEP BY STEP EXPLANATION :

  • Linear sistem.

A1 + 99d = 100 (-1)

A1 + 89d = 110

___________________

-A1 - 99d = -100

A1 + 89d = 110

___________________

-10d = 10

d = 10/(-10)

d = -1

Therefore , the value for d is -1.

OK.


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