Which graph represents the piecewise-defined function? y={−x+3   if  x< 12x−4   if  x≥1

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?

How do you solve a question like this?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?