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
d1i1m1o1n [39]
3 years ago
5

The mean of 7 numbers is 15. When an 8th number is added the mean decreases to 12. What is the 8th number?

Mathematics
1 answer:
ale4655 [162]3 years ago
3 0

Answer:

The 8th number is -9

Step-by-step explanation:

With an average, the sum of the seven numbers divided by 7 is 15.

In order to add an 8th number, we set up

\frac{7*15+x}{8}=12\\105 + x = 96\\x = -9\\\\\frac{105-9}{8}=\frac{96}{8}=12

You might be interested in
A washer and a dryer cost $799 combined. The washer costs $49 more than the dryer. What is the cost of the dryer?
rusak2 [61]
A) w + d = 799
B) w = d + 49
B) w -d = 49

Adding A & B
2w = 848

washer = 424

w -49 = d
dryer = 424 -49
dryer = 375


4 0
3 years ago
Please help I will give brainliest.
salantis [7]

Answer:

Multiply the numbers then Add on both sides then simplify

Step-by-step explanation:

8 0
2 years ago
Circles and inscribed angles
andreev551 [17]

Answer:

angle formed by two chords in a circle

Step-by-step explanation:

3 0
3 years ago
If f(x) = - 4x + 8, what is the value of f(-4)
kompoz [17]

Answer:

Hi there!

Your answer is:

f(-4) = 24

Step-by-step explanation:

F(-4) means to plug in -4 for x!

-4(-4) +8

16+8= 24

f(-4) = 24

I hope this helps!

5 0
3 years ago
Read 2 more answers
The perimeter of a rectangle is 90 inches. The width of the rectangle is 9 inches less than the length of the rectangle find the
Sphinxa [80]

Answer:

810

Step-by-step explanation:just

just multiply both numbers

7 0
3 years ago
Other questions:
  • Daniel spent a day hiking through a wildlife preserve. During the first hour of the hike, he drank 2 13/10 liters of water. writ
    12·1 answer
  • What is the length of the missing side FP? Round the answer to the nearest tenth please.
    6·2 answers
  • Help me find the answer
    8·1 answer
  • Calculate the distance between points A(4, 6) and B(-3, 9)
    12·1 answer
  • Holly I'm making gingerbread men take them both 2 minutes to make childrens bracelets at this rate how many people are needed to
    9·1 answer
  • Can someone please help me
    6·1 answer
  • Suzi needs to open her safe. She has forgotten the code!
    11·1 answer
  • Any one help with math pls I really need this today
    9·1 answer
  • Help i need i the answer asp pls​
    7·1 answer
  • Which model represents the product 3×25? (Giving brainliest.)
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!