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Anit [1.1K]
3 years ago
8

Please answer this and thank you If DE=4x+10, EF=2-1, and DF=9x-15, find DF.

Mathematics
1 answer:
professor190 [17]3 years ago
8 0
I hope that 2-1 means 21.

DE + EF = DF
4x + 10 + 21 = 9x - 15
4x + 31 = 9x - 15
31 = 9x - 4x - 15
31 = 5x - 15
46 = 5x
x = 9 1/5 = 9.2

You want 9x - 15
9*9.2 - 15
82.8 - 15
67.8 <<<<< answer. 
If I have given the wrong meaning to 2-1 (which could mean 1) leave another note and I will correct my work. 
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Read image for instructions
Oliga [24]

The last part answers the first part for you, just look at the y-values.

In other words:

<em>A'</em><em> </em>(-8, 2)

<em>B'</em> (-4, 3)

<em>C'</em> (-2, 8)

<em>D'</em> (-10, 6)

Explanation:

When you reflect any point over the x-axis, the y-value of the ordered pair is going to change.

This makes sense especially considering that the x-axis is horizontal, so the only way you could cross is to move up or down. If you were to move left or right, you'd only be able to cross the y-axis, since it's vertical.

Now for the last part, as I mentioned above, if you are reflecting across the y-axis, the x-values of the ordered pair is going to change.

<em>A'</em><em>'</em> (8, 2)

<em>B'</em><em>'</em> (4, 3)

<em>C'</em><em>'</em> (2, 8)

<em>D'</em><em>'</em> (10, 6)

Take note that the only thing that changes for the respective value is its sign, while the number itself stays the same.

3 0
2 years ago
How many boys are in the sculpting class ? Plz plz help asap ?
elena-14-01-66 [18.8K]
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2 years ago
Real easy math i just dont wanna do my hw.​
ahrayia [7]

Answer:

6x^2 (3x^2 - 2)

Step-by-step explanation:

18x^4 - 12x^2

6x^2 (3x^2 - 2)

6 0
3 years ago
the perimeter of an equilateral triangle is 6x - 12 in each side measures 24 if what is the value of x
Nadusha1986 [10]

Perimeter of an equilateral triangle = 3(side)

24 = 3(6x - 12)

Distributive property.

24 = 18x - 36

Add 36 to both sides.

60 = 18x

Divide both sides by 18

x = 3.33

6 0
2 years ago
A worde that place before a nawe<br>or pronden in a sentence​
bulgar [2K]

Answer:

Prepositions

Step-by-step explanation:

Prepositions are usually used in front of nouns or pronouns and they show the relationship between the noun or pronoun and other words in a sentence

6 0
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