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3 years ago

I NEED HELP PLEASE !!!

Mathematics

2 answers:

bija089 [108]3 years ago

4 0

Answer:

The first choice

Step-by-step explanation:

Perpendicular lines intersect to form right angles, like the x- and y-axis on a coordinate plane.

telo118 [61]3 years ago

4 0

Answer:

option 1 or A

Step-by-step explanation:

it is the definition of perpendicular lines

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7 + 7x - (2x) + 3 if x = -4

frutty [35]

Answer:

-10

Step-by-step explanation:

7 + 7(-4) - (2(-4)) + 3

7 - 28 - (-8)+3

7 - 28 +8 +3

= -10

4 0

2 years ago

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Multiply

Cloud [144]

Answer:

12 x^4 + 18 x^3 - 9 x^2 thus D is the correct answer.

Step-by-step explanation:

Expand the following:

3 x^2 (4 x^2 + 6 x - 3)

3 x^2 (4 x^2 + 6 x - 3) = 3 x^2 (4 x^2) + 3 x^2 (6 x) + 3 x^2 (-3):

3 4 x^2 x^2 + 3 6 x^2 x - 3 3 x^2

3 (-3) = -9:

3 4 x^2 x^2 + 3 6 x^2 x + -9 x^2

3 x^2×6 x = 3 x^(2 + 1)×6:

3 4 x^2 x^2 + 3×6 x^(2 + 1) - 9 x^2

2 + 1 = 3:

3 4 x^2 x^2 + 3 6 x^3 - 9 x^2

3×6 = 18:

3 4 x^2 x^2 + 18 x^3 - 9 x^2

3 x^2×4 x^2 = 3 x^4×4:

3×4 x^4 + 18 x^3 - 9 x^2

3×4 = 12:

Answer: 12 x^4 + 18 x^3 - 9 x^2

6 0

3 years ago

Which attribute applies to this set of lines?

sergeinik [125]

Answer: perpendicular lines

Step-by-step explanation:

4 0

3 years ago

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2x-y=8<br>x+2y=4<br><br>for the system of equation above, what is the value of x+y?

inysia [295]

2x+10y I thinks that’s the answer mb

3 0

3 years ago

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Triangle X Y Z is cut by line segment C D. Line segment C D goes from side X Y to side Y Z. The length of C D is 15, the length

Marizza181 [45]

The length of DZ is 4 units ⇒ 3rd answer

Step-by-step explanation:

Triangle X Y Z is cut by line segment C D, where

C lies on side XY and D lies on the side YZ
The length of C D is 15
The length of X Z is 18
The length of C Y is 25
The length of Y D is 20
C D and X Z are parallel
CX = 5 units

We need to find the length of DZ

In Δ XYZ

∵ C ∈ XY and D ∈ YZ

∵ CD // XZ

∴ m∠YCD = m∠YXZ ⇒ alternate angles

∴ m∠YDC = m∠YZX ⇒ alternate angles

In Δs YCD and YXZ

∵ m∠YCD = m∠YXZ

∵ m∠YDC = m∠YZX

∵ ∠Y is a common angle

∴ Δ YCD is similar to Δ YXZ by AAA postulate

- There is a constant ratio between their corresponding sides

∴ $\frac{YC}{YX}=\frac{CD}{XZ}=\frac{YD}{YZ}$

∵ YC = 25 units

∵ CX = 5 units

∵ YX = YC + CX

∴ YX = 25 + 5 = 30 units

∵ YD = 20 units

∵ YZ = YD + DZ

∴ YZ = 20 + DZ

Let us use the ratio of the corresponding side

∵ $\frac{YC}{YX}=\frac{YD}{YZ}$

∴ $\frac{25}{30}=\frac{20}{20+DZ}$

- Simplify $\frac{25}{30}$ by dividing up and down by 5

∵ $\frac{25}{30}=\frac{5}{6}$

∴ $\frac{5}{6}=\frac{20}{20+DZ}$

- By using cross multiplication

∴ 5(20 + DZ) = 6(20)

∴ 100 + 5 DZ = 120

- Subtract 100 from both sides

∴ 5 DZ = 20

- Divide both sides by 5

∴ DZ = 4 units

The length of DZ is 4 units

Learn more:

You can learn more about triangles in brainly.com/question/3202836

#LearnwithBrainly

8 0

3 years ago