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
larisa [96]
3 years ago
9

What is the value of x if the average of 10, 11, 12 and x is 9?

Mathematics
1 answer:
frosja888 [35]3 years ago
6 0

Answer: The value of x is 3.

Step-by-step explanation:

Since we have given that

10,11, 12 and x

Average of above numbers = 9

As we know that

Average is given by

\dfrac{\text{Sum of observation}}{\text{Number of observation}}\\\\\\\dfrac{10+11+12+x}{4}=9\\\\10+11+12+x=9\times 4\\\\33+x=36\\\\x=36-33\\\\x=3

Hence, the value of x is 3.

You might be interested in
Find the unite rate <br><br>there are 12 boxes with 108 items <br>how many items per box? <br>​
Butoxors [25]

there are 9 items in each box

7 0
3 years ago
What is the value of x?<br><br><br><br> Enter your answer in the box.<br><br><br> _____ units
krek1111 [17]

Answer:

x=28

Step-by-step explanation:

We can use similar triangles and proportions to solve this problem.  Put the side of the small triangle over the same side of the larger triangle.

x               42

---------- = ----------

x+10           42+15

Simplify

x               42

---------- = ----------

x+10           57

Using cross products

57x = 42 (x+10)

Distribute

57x = 42x+420

Subtract 42x from each side

57x-42x = 42x-42x +420

15x = 420

Divide each side by 15

15x/15 = 420/15

x=28

6 0
2 years ago
Read 2 more answers
What is equivalent to 5 squared times 9 squared
Pepsi [2]

Answer:

2,025

Step-by-step explanation:

5 squared is 5x5 = 25

9 squared is 9x9 = 81

25x81 = 2,025

4 0
3 years ago
Tom races his bicycle for 140 ft. A wheel of his bicycle turns 35 times as the bicycle travels this distance. What is the diamet
inna [77]

Answer:

1.3 ft

Step-by-step explanation:

perimeter = 140/35 = 4 ft

diameter = 4 ft/ 3.14 = 1.3 ft

6 0
3 years ago
Read 2 more answers
5. Three times the width of a certain rectangle exceeds twice its length by two inches. Four times its length is twelve more
damaskus [11]

Answer: A

Step-by-step explanation:

L=Length W=Width

3W=2L+2

4L=2L+2W+12

2L=2W+12

Option A

Hope this helps!! :)

Please let me know if you have any question or need further explanation

4 0
3 years ago
Other questions:
  • A fountain can hold 53,000 deciliters of water. How many kiloliters is this?
    11·1 answer
  • Choose the correct simplification of (5x3 − 5x − 8) + (2x3 + 4x + 2).
    13·2 answers
  • The area of a triangle is 1/2 (x^2 - 2x +2x^2 -4). The height h is x+2 Write an expression for the base b of the triangle. ( Hin
    5·1 answer
  • An experimenter has prepared a drug dosage level that she claims will induce sleep for 80% of people suffering from insomnia. Af
    6·1 answer
  • What is the simplest term for these fractions?
    7·1 answer
  • Solve the equation. 2(y – 4) = 4 SHOW YOUR WORK!
    10·1 answer
  • Melinda earns 5 minutes to play video games for every hour she spends on homework.
    5·2 answers
  • Billy rides his bike he records his time and distance each time he stops for a break how many miles will billy have traveled is
    10·1 answer
  • Kym used the integer tiles to find the sum of (–3) + 6. The line showed that the answer is negative 3. Which of the following do
    5·2 answers
  • PLZZ BRAINLIEST TO ANYBODY THAT CAN SOLVE THIS. (wrong or not at least try)
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!