All categories

2 years ago

15+9=? (5+3) What number is missing from the expression?

Mathematics

1 answer:

Airida [17]2 years ago

4 0

Answer:

<h3> $\boxed{ \boxed{ \bold{ \mathsf{3}}}}$ </h3>

Step-by-step explanation:

Let the missing number be 'x'

⇒ $\mathsf{15 + 9 = x(5 + 3)}$

Distribute x through the parentheses

⇒ $\mathsf{15 + 9 = 5x + 3x}$

Swap the sides of the equation

⇒ $\mathsf{5x + 3x = 15 + 9}$

Add the numbers

⇒ $\mathsf{5x + 3x = 24}$

Collect like terms

⇒ $\mathsf{8x = 24}$

Divide both sides of the equation by 8

⇒ $\mathsf{ \frac{8x}{8} = \frac{24}{8} }$

Calculate

⇒ $\mathsf{x = 3}$

Hope I helped!

Best regards!

You might be interested in

PLZZZZZZ NEED HELP!!!!!!!

tatyana61 [14]

The answer is (4,-3.4)

3 0

3 years ago

Best Buy is giving you a free t.v. with purchase of a new refrigerator. The t.v. is 30 inches tall and 48 inches wide. How big i

user100 [1]

Answer:

57 inches

Step-by-step explanation:

The height, width, and diagonal of the TV screen form a right triangle.

Use the pythagorean theorem, a² + b² = c², and solve for c, the hypotenuse/diagonal of the TV.

a² + b² = c²

30² + 48² = c²

900 + 2304 = c²

3204 = c²

56.6 = c

Round this to the nearest inch:

56.6

= 57

So, the diagonal of the TV screen is 57 inches

5 0

2 years ago

Discussion for Applications of Linear Systems

Lostsunrise [7]

Step-by-step explanation:

There are certain methods for solving a system of equations. Some of which are:

Substitution Method
Elimination Method
Graphing Method

Substitution Method

Substitution method to solve a system of equations is suitable if a variable of a any equation seems isolated or could comfortably be isolated without any ration/fraction resulting.

For example, for the following system of equations

x - 2y = 11....[A]

x = 5 - y....[B]

substituting the value of x = 5 - y from equation [B] into equation [A], so that

(5 - y) - 2y = 11

5 - y - 2y = 11

3y = -6

y = -2

Elimination Method

Elimination method to solve a system of equations is suitable if both equation are in standard form, and just adding or subtracting the equations to determine an equation in one variable.

For example, for the following system of equations

2x + 7y = -5....[C]

5x - 7y = 12....[D]

Adding Equation [C] and Equation [D].

7x + 0 = 7

x = 1

Graphing Method

Sometimes graphing method may be used to solve the system of the equation and visualize the solution.

For example,

y = -2....[E]

y = 3x + 1....[F]

The solution for this system of equation is the point of intersection of both the lines, which is shown in attached figure. The point of intersection is (-1, -2).

Hence, the solution of this system of equations is (-1, -2), as shown in attached figure.

Keywords: system of equations, elimination method, substitution method, graphing method

Learn more about solution of system of equations from brainly.com/question/2643311

#learnwithBrainly

6 0

3 years ago

I need the answer I will mark u brainalist

pashok25 [27]

Answer:

x= 1

Step-by-step explanation:

x = 1 is the axis of symmetric for the graph

if we draw a line parallel to the y axis one units to the right side of the origin we get the line of symmetry of the graph.

and since the line of symmetry is parallel to y axis and passes thru the point (1, 0) it's equation is x= 1

3 0

2 years ago

What is an equation of the line that passes through the point ( 6 , − 1 ) (6,−1) and is parallel to the line x − 3 y = 3 x−3y=3?

Nataly [62]

Answer:

y = 1

Step-by-step explanation:

Passes through (6,-1)(6,-1)

Find the slope (m)

m=(y2 - y1) / (x2 - x1)

m=(-1 - (-1) ) / (6-6)

m= 0

Parallel to x - 3y = 3

-3y = -x +3

y = 1/3 x -1

Equation of the line equation is y - y1 = m ( x - x1 )

y - ( -1 ) = 0 ( x - 6 )

y + 1 = 0

y = 1

4 0

3 years ago