Last year kristen read one fourth as many biographies as mysteries and eighteen more science fiction books than biographies. the number of nature books that she read was one less than the difference between the number of mysteries and the number of biographies. if kristen read four times as many science fiction books as nature books, than how many books did she read in all?

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.