An ant colony can double in size every 36 hours. Does this represent linear or exponential situation?

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale

As a self-employed seamstress, you know that it takes 7 yards of material to make 3 jackets. you bought 15 yards of material to make 7 jackets. did you buy enough material? if not, how much were you over or under?