The number of tickets sold for a concert event can be modeled by y-1x^2/10+3x+5 where x is the time in hours since the tickets have begun to sell, and y is the number of tickets sold per hour. For how long will tickets be sold? (In other words, for how long will y≥0) A. 30 hours B. 31.58 hours C. 63.16 hours D. 75.12 hours

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? 1. define a variable for the situation. 2. write an inequality that represents her profit. note: revenue is money coming in. cost is money going out. profit is the difference between the revenue and the cost. in other words: revenue - costs profit 3.using words, describe how many windows she must sell to have a profit of at least $48,000.