Can some body help me whit this i need to use the law of cosines and is a SAS case, please

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Atorch and a battery cost 2.50 altogether. the torch costs 1.50 more than the battery. what fraction of the total price is the torch? give your answer in its simplest form.

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate. true or false?