Ples help me, it's due by the end of class

How many $20 bills do you need to have to make $280

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

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?