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Issof claims that the scale factor is 1/2. which statement about his claim is correct

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?