0.9 x 30 = 27
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The simple way to double something more than once is to multiply the original number by 2 and then double the product until the final amount of doubles has been reached, in this case, 3. Doubling 33 3 times, we get 264
Okay say one is 1 dollar so they're giving you 3 of them for 2 dollars. If you get 3 for 2 dollars it would be like getting one for free. Full price would be dollars so you would take 2/3 which is .6... so you would take that from 10 which Gould be 33%
C. The lines curve opposite when typed into a graphing calculator. Check Desmos in the future when you need to see how line map out on to a graph. Hope this helps.