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Arturiano [62]
3 years ago
5

When is 20% off better than 20$ off

Mathematics
1 answer:
Crazy boy [7]3 years ago
7 0

Answer:

Price > 100$

Price > 150$

Step-by-step explanation:

Let us assume that x% off of price y$  is better than x$ off.

Hence, \frac{xy}{1000} > x  

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

⇒ y > 150$

Therefore, when the price is more than 150$, then only 20% of on the price is better than 30$ off. (Answer)

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Show that 2 - sqrt(2) is irrational
babunello [35]

Answer:

This proof can be done by contradiction.

Let us assume that 2 - √2 is rational number.

So, by the definition of rational number, we can write it as

2 -\sqrt{2} = \dfrac{a}{b}

where a & b are any integer.

⇒ \sqrt{2} = 2 - \dfrac{a}{b}

Since, a and b are integers 2 - \dfrac{a}{b} is also rational.

and therefore √2 is rational number.

This contradicts the fact that √2 is irrational number.

Hence our assumption that 2 - √2 is rational number is false.

Therefore, 2 - √2 is irrational number.

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3 years ago
A line has a slope of -2 and the point (2,7) lies on the line. What is the y-intercept of the line?
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Step-by-step explanation:

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2 years ago
Pls help<br> 8(c - 9) = 6(2c -12) - 4c<br> what is c?
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Answer:

C=0

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Please simplify 6d²(-7d)
andrew-mc [135]
Simplifying-
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How do I subtract 4m^2 + 2mn + 8n^2 from 2m^2 + 6mn + 2n^2 ?
SVETLANKA909090 [29]
-2m^2+4mn-6n^2

1) Let's write out both expressions subtracting 4m²+2mn+8n² from 2m²+6mn+2n²

\begin{gathered} 2m^{2}+6mn+2n^{2}-(4m^{2}+2mn+8n^2)_{} \\ 2m^2+6mn+2n^2-4m^2-2mn-8n^2 \\ -2m^2+4mn-6n^2 \end{gathered}

2) Note that when we subtract 4m^2 + 2mn + 8n^2 from 2m^2 + 6mn + 2n^2 we need to swap the sign by placing -1 outside the parentheses and then combine like terms adding those terms algebraically.

4 0
1 year ago
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