Subtract the expressions. (- 4b + 15 – 7k) – (6 + 4b - 2k)
( - 4b + 15 – 7k) – (6 + 4b – 2k) = (Simplify your answer.)

Will mark the brainliest.paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?