Given the following points from a quadratic equation, {(-1,,-,-,-,1)} find the rate of change between (-1,1) and (3,1) a 1 b undefined c -3 d 0

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?