Find all real zeros of the function f(x) = 12

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

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?

2x minus y equals 6, x plus y equals negative 3