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
n200080 [17]
3 years ago
5

The mean of five numbers 3,7,9,12, and x is 8. Find the value of x

Mathematics
1 answer:
jeyben [28]3 years ago
7 0
Answer:  " x = 9 "  .
____________________________________
Explanation:
____________________________________
To calculate the mean:
____________________________________
The mean = 

     {the sum of all the values in the number set} ÷ 

     {the number of values in the data set} ;
____________________________________
 To solve for "x" ;
____________________________________
Given that the "mean" is:  "8" ;
____________________________________
            8  =  { 3 + 7 + 9 + 12 + x }  /  5  ;
____________________________________ 
    ↔  { 3 + 7 + 9 + 12 + x }  /  5   =  8  ;
____________________________________
            →  { 3 + 7 + 9 + 12 + x }  = 8 * 5  ;
____________________________________
            →  { 31 + x } = 40  ;
____________________________________
            ↔   x + 31  = 40  ;
____________________________________
       Subtract "31" from EACH SIDE of the equation; to isolate "x" on one side of the equation; and to solve for "x" ;
____________________________________
            →   x + 31 − 31  =  40 − 31  ;

                       →  x = 9  .
____________________________________
You might be interested in
Just want to double check our answer.
bearhunter [10]

0 divided by 2 is 0.

You can use the multiplicative identity property: the product of any number and zero is still zero.

Hope this helped :)

3 0
3 years ago
Plot the vertex, focus, and directrix for the parabola represented by this equation. X=-1/12(y-2)^2+1
alukav5142 [94]

The vertex of the parabola is (1, 2), focus of the parabola is  (-2, 2), and directrix x = 4.

<h3>What is a parabola?</h3>

It is defined as the graph of a quadratic function that has something bowl-shaped.

We have a parabola equation:

\rm x = -\dfrac{1}{12}(y-2)^2+1

The standard form of the parabola:

\rm x = \dfrac{1}{4(f-h)}(y-k)^2+h

(h, k) is the vertex of the parabola and (f, k) is the focus.

\rm x = \dfrac{1}{4(-2-1)}(y-2)^2+1

h = 1, k =2, and f = -2

The directrix is x = 4

Thus, the vertex of the parabola is (1, 2), focus (-2, 2), and directrix x = 4.

Learn more about the parabola here:

brainly.com/question/8708520

#SPJ1

5 0
2 years ago
4
Vinil7 [7]

Answer:

A: Measure of center, also known as the Median.

3 0
3 years ago
A pen is being built that is 10 feet long and 20 feet wide. How much fencing material will be needed?
mr_godi [17]
Perimeter = 2(10+20) = 60feet

60ft fencing material is needed
7 0
4 years ago
Read 2 more answers
Need help on number one and three
Naya [18.7K]

An example for #1 would be that: 15 is divisible by 3, but not 9. every third multiple of 3, (9, 18, 27,...) is divisible by 9 because 9 is three times the size of 3.

For part two the first number that I thought of is 23.

4 0
3 years ago
Other questions:
  • Tamika has a hard rubber ball whose circumference measures 13 inches. she wants to box it for a gift but can only find cube-shap
    14·1 answer
  • One difference between synthetic division of polynomials and long division of polynomials is the fact that in synthetic division
    6·1 answer
  • Name a pair of vertical angle
    8·1 answer
  • On a piece of paper, graph y &lt; x + 1. Then determine which answer matches<br> the graph you drew.
    8·1 answer
  • When Elyse moved last weekend, the circular glass top for an end table broke. To replace it, she bought a circular glass top wit
    7·1 answer
  • What would be the correct answer?
    9·1 answer
  • Precise approximation of squar root of 12
    11·1 answer
  • Simplify:<br> 1 3/5 - 3/4x=-3 2/5
    14·2 answers
  • PLEASE HELPPP ITS A TEST THAT IS DUE IN LIKE 20 MIN THIS IS THE LAST QUESTION.
    9·2 answers
  • Brainly for correct answer!
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!