The price of oil decreased from $54 per barrel to $50 per barrel. what is the percent decrease in oil prices?

What is a graph with a never ending line called?

Which of the following are accepted without proof in a logical system? check all that apply.

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.