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Alexxx [7]
3 years ago
10

If DF =9x-39, find EF

Mathematics
1 answer:
pickupchik [31]3 years ago
5 0

Answer:

EF = 58

Step-by-step explanation:

From the question given, we obtained the following information:

DF = 9x – 39

DE = 47

EF = 3x + 10

EF =?

We'll begin by calculating the value of x.

This can be obtained as follow:

DF = DE + EF

DF = 9x – 39

DE = 47

EF = 3x + 10

DF = DE + EF

9x – 39 = 47 + 3x + 10

9x – 39 = 47 + 10 + 3x

9x – 39 = 57 + 3x

Collect like terms

9x – 3x = 57 + 39

6x = 96

Divide both side by 6

x = 96/6

x = 16

Finally, we shall determine the value of EF as follow:

EF =?

x = 16

EF = 3x + 10

EF = 3(16) + 10

EF = 48 + 10

EF = 58

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Three-fourths

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

∠QSR≅∠XZY ---> given problem

∠QRS≅∠XYZ ---> given problem

so

△QRS ~ △XYZ ----> by AA Similarity theorem

Remember that, if two triangles are similar, then the ratio of its corresponding sides is proportional and its corresponding angles are congruent

That means

\frac{QS}{XZ}=\frac{QR}{XY}=\frac{RS}{YZ}

∠Q≅∠X

∠R≅∠Y

∠S≅∠Z

<em>In the right triangle XYZ</em>

Find the tangent of angle X

tan(X)=\frac{YZ}{XZ} ---> opposite side angle X divided by adjacent side angle X

substitute the given values

tan(X)=\frac{9}{12}

Simplify

tan(X)=\frac{3}{4}

Remember that

∠Q≅∠X

so

tan(Q)=tan(X)

therefore

tan(Q)=\frac{3}{4} ---->Three-fourths

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