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
velikii [3]
2 years ago
9

Mean of four numbers a ,b, c, and d is 8 and mean of seven

Mathematics
1 answer:
Nana76 [90]2 years ago
4 0

Answer:

  • 17 1/3 or 17.33

Step-by-step explanation:

<u>Mean of four numbers a, b, c, and d is 8:</u>

  • (a + b + c + d)/4 = 8  
  • ⇒ a + b + c + d = 32

<u>Mean of seven numbers x, y, z, a, b, c and d is 12:</u>

  • (x + y + z + a + b + c + d)/7 = 12

<u>Substitute the sum of 4 numbers:</u>

  • x + y + z + 32 = 7*12
  • x + y + z = 84 - 32
  • x + y + z = 52

<u>Mean of x, y and z is:</u>

  • 52/3 = 17 1/3 or 17.33
You might be interested in
Five boxes of fruit snacks cost $22.50.
Viefleur [7K]

Answer:

13.5 answer is 13.5 and one cost 4.5

5 0
3 years ago
The solution set of a linear system whose augmented matrix is [a b c d] is the same as the solution set of Ax = d, where A = [a
Charra [1.4K]

Answer:

True

Step-by-step explanation:

First statement

[a b c | d][x]

[a b c]x=d

ax+bx+cx=d

Second statement

Ax=d

Given that A = [a b c]

[a b c]x=d

ax+bx+cx=d

ax+bx+cx=d

Then, they are going to have the same solutions

6 0
3 years ago
Question 4 of 14
uranmaximum [27]
It’s D
11x= 6x + 5x
10^2 + 6x + 5x + 3
2x(5x+3)+5x+3
8 0
2 years ago
A triangular courtyard has a perimeter of 120 meters. The lengths of two sides are 30 meters and 50 meters. How long is the thir
Masja [62]

Answer:

the third side is 40 m long

Step-by-step explanation:

The perimeter of the triangle is the sum of its three sides, and they give you what that value in meters is (120 m)

Your are given the length of two of them: 30 m and 50 m, and need to find the third one (let's call it "x" for this unknown side)

Now set the following equation:

Perimeter = side 1 + side 2 + side 3   --> replace these with the info you know

120 m = 30 m + 50 m + x   --> add 30 m and 50 m obtaining 80 m

120 m = 80 m + x  --> now solve for x (isolate the x on one side) by subtracting 80 m from both sides

120 m - 80 m = x  --> perform the subtraction 120 m - 80 m = 40 m

40 m = x

Which tells us that the third unknown side has a length of 40 m

7 0
3 years ago
Read 2 more answers
5j+s=t-2 solve for t
Gekata [30.6K]

The answer is

T= 5j+s+2


4 0
3 years ago
Read 2 more answers
Other questions:
  • Ralph has budgeted $175 for entertainment. He uses this money to go out on dates for $35 or to go out with his friends for $15.
    14·1 answer
  • Sage correctly found the following quotient. 1 1/2 divided by 1/3= 4 1/2 . (a) Create a model to show the quotient. (b) Explain
    11·1 answer
  • For every 3 girls in Mr Hegarty's class there are 4 boys. What is the ratio of girls to boys in the class?
    10·1 answer
  • List 3 values that would make this inequality true. Y-30&lt;43
    14·1 answer
  • Which expression is shown using the model below? A model with 6 rows of 6 squares and 6 rows of 5 squares. 5 (6 + 6) 5 (6 + 5) 6
    11·1 answer
  • 6-11.5)<br> ?<br><br> What is the value of the expression 6 3/4 ( -11.5)
    12·1 answer
  • In Ms. Henrick's class, there are 10 boys and 12 girls. What is the ratio of boys to girls? Express your answer as a fraction in
    6·2 answers
  • The formula for the volume of a tetrahedron is given as v=sh. Rewrite the
    9·1 answer
  • 3. The graph f(x) = -x - is shown below.
    15·1 answer
  • a music store has 40 trumpets 39 clarinets 24 violins 51 fluites and 16 trambones in stock write each ratio in simplest gorm
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!