Which equation has a graph that is a parabola with a vertex at (5, 3)?

What is coefficient of the term of degree of degree 5 in the polynomial below

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?

Robert is placing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other area is 5.7 feet. the sod costs y dollars per square foot