Hm what is it? Answer pls

Asap 25 pts + brainlest to right/best answer

Which expression is equal to (f+g)(x)?

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?