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can someone help me answer these? it says some of mine are incorrect

Another common relationship in physics is the exponential relationship. Consider the relationship between $x$ and $y$, where $x$ is the independent variable and $y$ is the dependent variable. The exponential fit can be applied to derive an expression for the relationship between $x$ and $y$. $y=Aexp(?Cx?)$ A student measured the Voltage $(V)$ across a capacitor (in discharge mode) as a function of time (t). The student data is shown below. Use EXCEL to plot the capacitor voltage $(V_{c})$ versus time $(t)$, and apply the exponential fit. Determine the fitting parameters ( $A$ and $C$ ). $V=exp(?t/)(3sig. fig.)$
The A unit is: Hint: the unit symbol. The $C$ unit: Hint: the unit symbol.

Comparing y=Aexp?(?xC)and y=99