If you really know the answer, please pm me. And how you express that problem in function.

The next time you challenge other users, I suggest you offer bigger points or the brainliest vote. Thanks.

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If you really know the answer, please pm me. And how you express that problem in function.

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2,200...........................

The Brainliest Answer!

a₁ (first month) = 500

d (common difference) = 100

a₆ = 6th month

a₁₂ = 12th month

an = a₁ + (n-1) (d)

= 500 + (n-1) (100)

= 500 + 100n - 100

= 100n + 500 - 100

= 100n + 400

Allowance for the 6th month, a₆:

a₆ = 100 (6) + 400

a₆ = 600 + 400

Allowance for the 12th month:

a₁₂ = 100(12) + 400

a₁₂ = 1,200 + 400