What are the greatest common factor of 28 and 32

Which statement best describes the polynomial

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?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)