Luther and nicole were on a hiking trip. they began at an elevation of 139m above the sea level and descended to an elevation of 21 m below sea level in 8h.
a)write a divison expression that can be used to find their average change in elevation per hour
b)use an integer to represent their average change in elevation per hour

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.