The screenshot below is from a template solution for a problem. Assume that all values under 'Input Parameters' are constant and would not change. Values under 'Decision Variables' are decision variables and can be changed.

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For the following formula, will the result be linear, non$-$linear, or cannot be determined?

$=$ C$3*$C$15+$D$3*$D$15+$E$3*$E$15$