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Elis [28]
3 years ago
9

How would the expression x-9 be rewritten using Difference of Squares?

Mathematics
1 answer:
yaroslaw [1]3 years ago
4 0

Answer:

Step-by-step explanation:

(x+3)(x-3)

x squared and -9 are both square numbers.

the square root of x^2 is x

the square root of -9 is 3. so you just need to write (x+3)(x-3)

you can check by expanding the brackets and the middle x terms should cancel out

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Use the information in the diagram to determine the height of the tree to the nearest foot.
Illusion [34]
The answer is 80 ft. 

Based on the diagram we know that the tree triangle and the building triangle are similar triangles where the lengths of each are proportional to the other. 

The lengths of the triangle the tree makes are half of the lengths of the building triangle. So this problem can be solved using ratio and proportion:

\frac{144}{160} =  \frac{72}{x}

to solve for x, all you need to do is cross multiply then divide. 

\frac{160*72}{144} =x

The answer is then 80ft.

Another way to solve this is just by using logic. If the lengths of the tree triangle is half of the building, simply divide the lengths of the building triangle by two. 

160ft/2 = 80ft. 

8 0
3 years ago
Or Classroom Partner
meriva

$137.5 is the money does Nancy have.

<u>Step-by-step explanation:</u>

The given information are,

  • Steve has a total money = 55
  • Nancy has a money = 250% as much money as Steve.

We know that, from the given data the money that Steve has is 55.

This means that, Nancy has money = 250% of 55.

Let us assume,

x be the total money that Nancy have.

Therefore, x = 250% of 55.

The percentage can be represented as 1 divided by 100.

⇒ x = (250 × 1/100) × 55

⇒ x = 2.5 × 55

⇒ x = 137.5

The money does Nancy have is 137.5

3 0
4 years ago
Are my choices correct?
trapecia [35]

Answer:

Just select all

Step-by-step explanation:

8 0
3 years ago
Bottles of water sell for $1.50 each. Graph the relationship between the number of bottles of water sold and the total cost.
Nimfa-mama [501]
You would move 1 over on the x axis, and 1.5 up on the y axis, 2 over, then 3 up, and so forth
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4 years ago
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Answer: -0.25 and 5

Step-by-step explanation:

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