Solution

$$\text { The major product can be controlled with temperature. } \\$$
$$\text { - At low temperatures, the lowest energy transition state } \\$$
$$\text { will determine the major product (addition to the } \\$$
$$\text { carbon best able to stabilize positive charge). This is } \\$$
$$\text { kinetic control. } \\$$
$$\text { - At higher temperatures, the reaction is reversible and } \\$$
$$\text { product distribution will favor the more stable product } \\$$
$$\text { (the more substituted alkene). This is thermodynamic } \\$$
$$\text { control. }$$