Can someone show how to answer this precal question

In the equations, a and b represent the price per night for a room in hotel a and hotel b, respectively, w weeks after september 1 last autumn. what was the price per night in hotel a when it was equal to the price per night in hotel b? a = 240 − 20w b = 320 − 30w

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Which statement about perfect cubes is true