The extension, e, of a spring is proportional to the mass, m, hung from the spring. A mass of 2kg gives an extension of 5cm.
(a) Find the relationship between e and m.
(b) Use this relationship to find the mass needed to give an extension of 40mm

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.