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3 years ago

Find the sale price when the original price is $210.20 and the discount rate is 40%

Mathematics

2 answers:

garri49 [273]3 years ago

5 0

If the discount rate is 40%, the amount you are paying is 60%
210.2×.6= 126.12
.6= 60%
So the answer is $126.12

Nuetrik [128]3 years ago

4 0

$5.255 I hope this helps

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lutik1710 [3]

theoretical probability is a coin will land on heads 50% of the time

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3 years ago

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31= -(1+p) +4CP+6)<br><br> Please help solve

Dimas [21]

Answer:

p=4CP - 26

C= p/4P + 13/2P

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Step-by-step explanation:

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Rzqust [24]

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3 years ago

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ELEN [110]

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Step-by-step explanation:

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3 years ago

Prove that root 7 is irrational by the method of contradiction

Alchen [17]

Let assume that $\sqrt7$ is a rational number. Therefore it can be expressed as a fraction $\dfrac{a}{b}$ where $a,b\in\mathbb{Z}$ and $\text{gcd}(a,b)=1$ .

$\sqrt7=\dfrac{a}{b}\\\\7=\dfrac{a^2}{b^2}\\\\a^2=7b^2$

This means that $a^2$ is divisible by 7, and therefore also $a$ is divisible by 7.

So, $a=7k$ where $k\in\mathbb{Z}$

$(7k)^2=7b^2\\\\49k^2=7b^2\\\\7k^2=b^2$

Analogically to $a^2=7b^2$ ------- $b^2$ is divisible by 7 and therefore so is $b$ .

But if both numbers $a$ and $b$ are divisible by 7, then $\text{gcd}(a,b)=7$ which contradicts our earlier assumption that $\text{gcd}(a,b)=1$ .

Therefore $\sqrt7$ is an irrational number.

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4 years ago