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3 years ago

Which equation is represented by the phrase “two times a number equals six”?

Mathematics

2 answers:

wel3 years ago

7 0

Answer:

equation 2x = 6 .

Step-by-step explanation:

Given : phrase “two times a number equals six”

To find : Which equation is represented .

Solution : We have given phrase “two times a number equals six”

Let the number = x

According to question :

Two times a number = 2x .

That is equal to 6.

Hence ,

2x = 6.

Therefore, equation 2x = 6 .

ruslelena [56]3 years ago

5 0

The equation represented is 2x=6 or 2(x)=6

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Does anyone know how to do this? Thanks!

Nataly [62]

C. 5

Step-by-step explanation:

The coeff of

${x}^{5}$

Is 15.

So by that we can write 3m = 15

m is 5.

8 0

3 years ago

Hi, teacher I was absent these days and I didn’t understand anything about this lesson and I need help this is not count as a te

motikmotik

Given:

There are given that the cos function:

$cos210^{\circ}=-\frac{\sqrt{3}}{2}$

Explanation:

To find the value, first, we need to use the half-angle formula:

So,

From the half-angle formula:

$cos(\frac{\theta}{2})=\pm\sqrt{\frac{1+cos\theta}{2}}$

Then,

Since 105 degrees is the 2nd quadrant so cosine is negative

Then,

By the formula:

$\begin{gathered} cos(105^{\circ})=cos(\frac{210^{\circ}}{2}) \\ =-\sqrt{\frac{1+cos(210)}{2}} \end{gathered}$

Then,

Put the value of cos210 degrees into the above function:

So,

$\begin{gathered} cos(105^{\circ})=-\sqrt{\frac{1+cos(210)}{2}} \\ cos(105^{\operatorname{\circ}})=-\sqrt{\frac{1-\frac{\sqrt{3}}{2}}{2}} \\ cos(105^{\circ})=-\sqrt{\frac{2-\sqrt{3}}{4}} \\ cos(105^{\circ})=-\frac{\sqrt{2-\sqrt{3}}}{2} \end{gathered}$

Final answer:

Hence, the value of the cos(105) is shown below: