$.60 mark up to 25% how much would that charge?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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 jamie pay at the end?