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2 years ago

4[9(5-4)2] what is the answer

Mathematics

1 answer:

SVEN [57.7K]2 years ago

4 0

Answer:

Step-by-step explanation:

5-4=1

9x1=9

9x2=18

18x4=72

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Choose which line represents the line of best fit.

Leona [35]

Answer:

Iine B

Step-by-step explanation:

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2 years ago

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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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3 years ago

Which is better to buy 14 rolls of paper towels for $18

Feliz [49]

In order to find out what deal is better:

We have to find the unit rate for each deal

Total amount of paper towels ÷ The price

So it would be....

18 ÷ 14 = 1.285714
12 ÷ 10 = 1.2

Short Answer:

The better deal is 10 rolls of paper towels for $12.

Long Answer:

I wanted to find out the price per roll of paper towel for each deal so I created a unit rate problem which is the numerator divided by the denominator. From there, I was able to get my answers, compare which one was less than the other, and select the best deal.

Hopefully this helped >-<

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1 year ago

Blake is 28 years younger than Linda. 6 years ago, Linda's age was 2 times Blake's age. How old is Blake now?

PIT_PIT [208]

Blake is now 34 apparently

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3 years ago

PLS I HAVE NO TIME I'LL MARK YOU BRAINLIST !!!

Umnica [9.8K]

2.-4 should be right for all of them

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2 years ago