Please helps me right now
Find the domain (ax-ay)/(5x^(2)y^(2))(-(5xy)/(by-bx ))

Chemistry balance then what type of reaction are they i don't know why it keeps saying math when i put chem

You paid $7.70 to the mail package that weighed 5.5 lb. right and solve any quetion to find the cost per pound ? ?

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?