Please answer this correctly without making mistakes I want ace expert and genius people to answer this correctly without making mistakes

What is the vertex form of f(x) = x2 + 6x + 3

Issof claims that the scale factor is 1/2. which statement about his claim is correct

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60