Write a compound inequality for the following graph -4 and 0

Can someone answer these problems for me

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?

Polynomial that can be factored as (3x-4)(3x+4)