HELP ASAP PLZ

Solve this problem.
b - 6 < 4

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

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.