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S(x) = 0.046x + 0.018(1000-x)

Step-by-step explanation:

Given that:

   A fund rate: 4.6% = 0.046

   Saving account rate:  1.8% = 0.018

Let x is the amount Jacy invest in the fund so (1000-x) is the amount he invests in the  savings account​

So a polynomial  function S(x) to represent the interest Jacy will earn in 1 year is:

S(x) = 0.046x + 0.018(1000-x)

Hope it will find you well.