Pls asap me with 7, 8, and 9! (show ) + lots of )

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

Find the value of x for which line a is parallel to line b

The track team ran a mile and a quarter during their practice how many kilometers did her team runs?