A stick of butter is taken from the refrigerator and set out on the counter to soften. The temperature of the butter will warm to room temperature over time. The temperature of the butter can be modeled by the following function:
f(t)=68−32⋅2.718⁻⁰.⁰⁶ᵗ
where t is measured in minutes after the butter is taken out of the refrigerator.