What is 12 15/9 in simplest form?

Which of the following equations is equivalent to x/3-6/x=1

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

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?