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2 years ago

Tìm x biết rằng 2x - 4 = 5

Mathematics

2 answers:

LenaWriter [7]2 years ago

6 0

Answer:

The answer is $\frac{9}{2}$

Step-by-step explanation:

$2x-4=5\\2x=5+4\\x=\frac{9}{2}$

Dmitrij [34]2 years ago

5 0

Answer:

start by adding 4 to the other side. Now you have 2x=9. Now in order to get x by itself you divide and get x=9/2.

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The sum of three numbers is 121 The third number is 3 times the second. The first number is 6 times the second. The first number

Mama L [17]

Answer:

The first number is

72.6

Step-by-step explanation:

Let second number be x.

First number= 6x

Third number= 3x

According to question,

6x+x+3x=121

or, 10x=121

or,x=121/10=12.1

First number= 6x=6×12.1=72.6

Third number=3x=3×12.1=36.3

3 0

2 years ago

Read 2 more answers

Can someone answer part B for me? Thank you and will give brainliest.

frez [133]

Answer:

The answer to part B is B.

Step-by-step explanation:

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4 0

3 years ago

arlik [135]

Given:

In a right angle triangle θ is an acute angle and $\tan\theta =\dfrac{3}{5}$ .

To find:

The value of $\cos \theta$ .

Solution:

In a right angle triangle,

$\tan \theta=\dfrac{Perpendicular}{Base}$

We have,

$\tan\theta =\dfrac{3}{5}$

It means the ratio of perpendicular to base is 3:5. Let 3x be the perpendicular and 5x be the base.

By using Pythagoras theorem,

$Hypotenuse=\sqrt{Perpendicular^2+base^2}$

$Hypotenuse=\sqrt{(3x)^2+(5x)^2}$

$Hypotenuse=\sqrt{9x^2+25x^2}$

$Hypotenuse=\sqrt{34x^2}$

$Hypotenuse=x\sqrt{34}$

In a right angle triangle,

$\cos \theta=\dfrac{Base}{Hypotenuse}$

$\cos \theta=\dfrac{5x}{x\sqrt{34}}$

$\cos \theta=\dfrac{5}{\sqrt{34}}$

Therefore, the value of $\cos \theta$ is $\dfrac{5}{\sqrt{34}}$ .

8 0

2 years ago

Find the measure of angle b (image below)

IRINA_888 [86]

Angle b will be 34 degrees because angle b and the other angle that is 34 degrees are vertical angles!

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3 years ago

Plss help ill mark brainlist

disa [49]

Answer:

Step-by-step explanation:

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2 years ago