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3 years ago

The sum of 9 and a number is twice a number plus 14. Write an equation.

Mathematics

1 answer:

Olin [163]3 years ago

6 0

Answer:

9+x = 2y+14

Step-by-step explanation:

It says 9 plus a number, so plug in x for 'a number', and it says 'is twice a number plus 14'. Plug in '=' for is another variable for 'a number', and last but not least, just put +14 for plus 14

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6 + [-25 = (-3 + 2. 1)]

antiseptic1488 [7]

Answer:

6+[25=(-0.9)]

6+[-22.5]

-16.5

Step-by-step explanation:

the answe of this question will be -16.5

5 0

3 years ago

Find the value c that will make 9x^2 +30x+c a perfect square trinomial

anzhelika [568]

Answer:

$c = 25$

Step-by-step explanation:

Given :-

A quadratic equation is given to us.
The equation is 9x² + 30x + c .

And we need to find out the value of c for which the given trinomial is a perfect square. On looking at the given expression all the terms are having positive signs before them .So we can rewrite it on the basis of ,

Identity :-

$\implies (a+b)^2=a^2+b^2+2ab$

Let's try to set the equation on this Identity .

The firsr term is 9x² . We can write it as ,

$\implies 9x^2=(3x)^2$

Hence the middle term here should contain 3 and 2 as their factors. Let's Break the middle term .

$\implies 30x = 2.3x.5$

Therefore in order to make the whole expression as perfect square 5² must be replaced by c . The expression would become ,

$\implies 9x^2+30x + 5^2 \\\\\implies (3x)^2+2.3x.5 +5^2\\\\\implies (3x+5)^2$

Hence the value of c should be 25 .

8 0

3 years ago

Read 2 more answers

On a map ,shantis house is located at (-5,6) and the middle school is located at (-5,-4) and the elementary school is located at

tino4ka555 [31]

Answer:

Shanti is 10 units away from the middle school

Step-by-step explanation:

Plot the given points on an x-y coordinate set of axes as shown in the attached image.

Notice that Shanti's location is given with an orange point, and that the middle school location with a green point.

Since they both have the same x-coordinate value (-5), it is very simple to calculate the distance in between them by simply counting the number of units that separate them vertically.

If you do such you get your answer: 10 units.

7 0

3 years ago

I dont now what it is

Vanyuwa [196]

Answer:

Its option C

As,

x+8=3x

8= 3x-x

8=2x

8/2=x

4=x

#x=4

4 0

2 years ago

What is the measure of an anglethat is supplementary to an angle of 37°? A. 127° B. 53° C. 143° D. 323°

KengaRu [80]

Answer:

143°

option c is correct!

Explanation:

Given:

Two angles are supplementary:

One angle = 37°

We know if two angles are supplementary their sum is equal to 180°.

Let another angle be x°

= > 37° + x° = 180

= > x° = 143°

Therefore another angle is 143°.

8 0

3 years ago