Astudent uses a submarine to study ocean life. she begins at sea level, which is at an elevation of 0 feet. she travels down for 90 seconds at a speed of 3.5 feet per second. she then travels directly up for 30 seconds at a speed of 2.2 feet per second. after this 120-second period, how much time, in seconds, will it take for the scientist to travel back up to sea level at the submarines maximum speed of 4.8 feet per second

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.