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marvezunderwood
28.10.2019 •
Mathematics
When is 20% off better than 20$ off
for what prices are x% off better than x$ off
for what prices are 20% off better than 30$ off
Solved
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Ответ:
Price > 100$
Price > 150$
Step-by-step explanation:
Let us assume that x% off of price y$ is better than x$ off.
Hence,
Hence, y > 100
Therefore, when the price is more than 100$, then only x% off on the price is better than x$. (Answer)
Again, assume that 20% off on price y$ is better than 30$ off.
Hence,![\frac{20y}{100} 30](/tpl/images/0349/0522/be00c.png)
⇒ y > 150$
Therefore, when the price is more than 150$, then only 20% of on the price is better than 30$ off. (Answer)
Ответ:
a) 6x+1
b)5x+ 31
c)56
Step-by-step explanation:
combine like terms to get a an b then use substitution to get c