Select all of the equations for which the solution is 20. a) n-4 b) 10n=20 c) n/5=4 d)7+n=13 wander !

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?