1. The problem asks to identify which function is not quadratic. 2. A quadratic function is generally of the form $$f(x) = ax^2 + bx + c$$ where $a \neq 0$. 3. Let's analyze each option: a) $$f(t) = 2x^2 - 10$$ is quadratic because it has an $x^2$ term. b) $$f(g) = (x + 5)(x - 8)$$ expands to $$x^2 - 3x - 40$$ which is quadratic. c) $$12x - 16y = 102$$ is a linear equation in $x$ and $y$, not quadratic. d) $$4x - 10 = \frac{y}{2x}$$ can be rewritten as $$y = 2x(4x - 10) = 8x^2 - 20x$$ which is quadratic. 4. Therefore, the function in option c) is not quadratic. Final answer: c) 12x - 16y = 102 is not quadratic.