Me im new to this program and i dont know how to do this

Simplify using positive exponents only.

Which expression is equivalent to 64 - 9x^2?

Amy is plan her school's new basketball court. the west edge of the basketball court is located on the line y = 5x + 2. the east edge cannot intersect with the west edge. on which line could the east edge be located? −y − 5x = 100 y + 5x = 100 −5x − y = 50 5x − y = 50