Which expression is equivalent that (x^2-3x)(4x^2+2x-9)?

A. x^2(4x^2 + 2x - 9) - 3x(2x - 9)

B. x^2(4x^2 + 2x) - 3x(2x - 9)

C. x^2(4x^2 + 2x - 9) - 3x

D. x^2(4x^2 + 2x - 9) + 3x(4x^2 + 2x - 9)

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.