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Let w=23 . what is the value of w + 45 ?

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days