Doug’s family buys 7 postcards while on vacation. each postcard costs 0.25$ including tax. how can doug use place value patterns to check his answer.

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?