9. Let Q represent a mass of carbon 14 whose half-life is 5,715 years. The quantity of carbon 14 present after t years is given by the following model. Q = 10(1/2)^t/5715

Will mark the brainliest. 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?