Find the x-intercepts of the parabola with vertex (2,-14) and y-intercept (0,6)​

Whats the name of the vertical axis

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

I’m really confused and need to learn this