1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lora16 [44]
3 years ago
15

What is the value of x? Explain. 12 + x=4

Mathematics
2 answers:
Vikki [24]3 years ago
5 0

Answer:

X= -8

Step-by-step explanation:

4-12=-8

You must reverse the problem so that you are solving for x, rather than 4.

ivolga24 [154]3 years ago
4 0

Answer:

12+x=4

12-4=x

8=x

x=8 is the answer please mark my answer is brainliest

You might be interested in
The face of the triangular concrete panel shown has an area of 22 square meters, and its base is 3 meters longer than twice its
Elodia [21]

Answer:

The length of the base is 11 meters.

Step-by-step explanation:

The diagram of the triangle is not shown; However, the given details are enough to solve this question.

Given

<em>Shape: Triangle</em>

<em>Represent the height with h and the base with b</em>

b = 3 + 2h

Area = 22

Required

Find the length of the base

The area of a triangle is calculated as thus;

Area = \frac{1}{2} * b * h

Substitute 22 for Area and 3 + 2h for b

The formula becomes

22 = \frac{1}{2} * (3 + 2h) * h

Multiply both sides by 2

2 * 22 = 2 * \frac{1}{2} * (3 + 2h) * h

44 = (3 + 2h) * h

Open the bracket

44 = 3 * h + 2h * h

44 = 3h + 2h^2

Subtract 44 from both sides

44 - 44 = 3h + 2h^2 - 44

0 = 3h + 2h^2 - 44

Rearrange

0 = 2h^2 +3h - 44

2h^2 +3h - 44 = 0

At this point, we have a quadratic equation; which is solved as follows:

2h^2 +3h - 44 = 0

2h^2 + 11h - 8h - 44 = 0

h(2h + 11) - 4(2h + 11) = 0

(h - 4)(2h + 11) = 0

Split the above

(h - 4) = 0\ or\ (2h + 11) = 0

h - 4 = 0\ or\ 2h + 11 = 0

Solve the above linear equations separately

h - 4 = 0

Add 4 to both sides

h - 4 + 4 = 0 + 4

h = 0 + 4

h = 4 ---- <em>First value of h</em>

2h + 11 = 0

Subtract 11 from both sides

2h + 11 - 11 = 0 - 11

2h  = 0 - 11

2h = -11

Divide both sides by 2

\frac{2h}{2} = -\frac{11}{2}

h = -\frac{11}{2}<em> ------ Second value of h</em>

Since height can be negative, we'll discard h = -\frac{11}{2}

Hence, the usable value of height is h = 4

Recall that b = 3 + 2h

Substitute 4 for h

b = 3 + 2(4)

b = 3 + 8

b = 11

Hence, the length of the base is 11 meters

3 0
3 years ago
For all values of x f(x)
Firlakuza [10]

Answer:

f(g(5)) = 64

g(f(5)) = 28

Step-by-step explanation:

Given  that f(x) = x^2 and g(x) = x+3

f(g(x) = f(x+3)

f(x+3) = (x+3)^2

f(g(x)) = (x+3)^2

f(g(5)) = (5+3)^2

f(g(5)) = 8^2

f(g(5)) = 64

b) g(f(x)) = g(x^2)

g(f(x)) = x^2 + 3

g(f(5)) = 5^2 +3

g(f(5)) = 25 + 3

g(f(5)) = 28

Hence the value of g(f(5)) is 28

5 0
3 years ago
PLEASE help me with THIS QUESTIOn plz ASAP thank u.
Lyrx [107]
It would be: if you want me to explain let me know

6 0
3 years ago
Read 2 more answers
X + 3 = -1 Prove x<br> Need help I need to see work. Don’t understand this problem.
raketka [301]

Answer:

x=-4

Step-by-step explanation:

X needs to be a number that when 3 is added to it, becomes -1. So, adding 3 to -4 gives you -1, therefore, x=-4. Hope this helped!

8 0
3 years ago
PLEASE HELP MATH!! (BRAINLIEST + MORE) questions in picture!
klasskru [66]

Answer:

A) 2x*2 +6x -3x - 9= 2x*2 +3x -9

B) 2yx*2 +2yx +2y +3x*2 +3x +3

C) 36x*2 y +48yx +3xy*2 + 4y*2

D) 2x*3 - 4x*2 y + 3x -6y

7 0
2 years ago
Other questions:
  • Which measurement is most accurate to describe the weight of a laptop computer?
    6·1 answer
  • Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and section B had 20 students
    5·2 answers
  • From the top of a 193 foot lighthouse the angle of depression to a ship in ocean is 14° how far is the ship from the base of the
    5·1 answer
  • determine the quadratic equations whose graph is given the vertex is (1,1) and the y intercept is (0,-7).
    7·1 answer
  • Find the coordinates of point B that lies along the directed line segment from A(-5, 2) to C(11, 0) and partitions the segment i
    11·1 answer
  • Which number sentence is true?
    5·2 answers
  • If cos x=−6/7, and 90°
    12·1 answer
  • Two distinct number cubes are rolled together. Each number cube has sides numbered 1 through 6.
    6·1 answer
  • Given: AM = 8, AB = 5x +1 and M is the midpoint of AB, find x and AB<br> X=<br> AB=
    9·1 answer
  • Help asap please help​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!