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Rama09 [41]
1 year ago
7

Which equation has a solution of x = 4

Mathematics
1 answer:
sveticcg [70]1 year ago
3 0

Answer

Option B is correct.

Only the equation, 3x + 9 = 21, has a solution of x = 4.

Explanation

We are told to pick the equation(s) with x = 4 as a solution from the equations,

5x - 8 = 44

3x + 9 = 21

4x = 24

x - 10 = -8

The step to solving this is to insert x = 4 and check if that is consistent with the given equation.

Option A

5x - 8 = 44

If x = 4

5(4) - 8 = 44

20 - 8 = 44

12 ≠ 44

Hence, this is not an answer

Option B

3x + 9 = 21

If x = 4

3(4) + 9 = 21

12 + 9 = 21

21 = 21

Hence, this is an answer for this question.

Option C

4x = 24

If x = 4

4(4) = 24

16 ≠ 24

Hence, this is not an answer to this question.

Option D

x - 10 = - 8

If x = 4

4 - 10 = -8

-6 ≠ -8

This is also not an answer to this question.

Hope this Helps!!!

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Answer:

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Step-by-step explanation:

To first solve this problem, we need to figure out the size of an interior angle for a regular hexagon.

This can be done with the formula :

angle = \frac{(n-2)*180}{n} , with n being the number of sides

A hexagon has 6 sides so here is how we would solve for the interior angle:

\frac{(6-2)*180}{6}=120 , with n= 6 sides

Now that we know that each interior angle in the hexagon is 120 degrees, we can now turn our attention to the rhombus.

The opposite angles of the rhombus are congruent, so the two larger obtuse angles are congruent, and so are the two smaller acute angles.

It is also important to note that a rhombus is a quadrilateral, so all of its interior angles add up to 360 degrees.

Looking at the rhombus, we already know one of the angles because it is shared by the interior angle of the hexagon, so the two larger angles in the rhombus are both 120 degrees.

But what about the smaller angles? All we need to do is subtract the two larger angles form 360 and divide by 2 to find the angle.

\frac{360-2(120)}{2} = 60 , so the smaller angle in the rhombus is 60 degrees.

Now that we know both the interior angle and smaller angle of the rhombus, we can find x.

Together, angle x and the angle adjacent to it makes up an interior angle of the hexagon, so x plus that angle is going to equal to 120 degrees.

All we need to do is solve for x:

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3 years ago
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Answer:

Her daughters age: 1/2x

Step-by-step explanation:

Let's say Rani's present age is x. Her age is twice the age of her daughter.

So if Rani's age is 20, her daughters age would be 10, because Rani is twice the age of 10; so 10 times 2 would be 20.

1/2(20)=daughter's age

so if you substitute x into 20 because we don't actually know Rani's age, it would be 1/2(x)=daughter's age.

hope this helped :-) <3

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