What is the third term in the binomial expansion of (3x + y3)4?

54x^2*y^3
18x^2*y^3
18x^2*y^6
54x^2*y^6

Which of the following circles have their centers in the third quadrant? check all that apply.

Factor the polynomial by its greatest common monomial factor.

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?