To model 15 – 11 on a number line, begin at _______ and travel 11 units to the left.
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Hope these help but i wrote all of it out with all its geometrical reasons
Multiply 50 by 0.90 because you take a discount of 10% off. 1.00 = 100% 0.10 = 10% 0.01 = 1% if you multiply 50 by 0.10 instead you get the amount that is discounted instead of the new selling price.