I don’t under this pls help thank you

Solve the system of equations. y= 2x y= x^2 - 15

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

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 jame pay at the end?