Harry have to pay back $9000 each month.
A function is a relationship between a number of inputs where each input has exactly one output.
Given
Bank loan taken out by Harry.
Harry's remaining debt, expressed in dollars, is modelled as a function of time t, expressed in months, by the function D(t).
Given function is,
D(t) = - 200t + 9000
This function can be used to determine that $200 is being subtracted each month from the function, meaning Harry is paying $200 toward his loan.
Harry has not yet made any payments, therefore we may set t=0 to obtain the total amount of his solo. Therefore, the value of D(t) will reveal the loan's net amount.
If t = 0
D(0) = - 200(0) + 9000
D(0) = 9000
Harry have to pay back $9000 each month.
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