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
igomit [66]
3 years ago
9

there are 20 children at a library 6 of the children have an average age of five years the remaining children have an average ag

e of 8 years what is the average age of all the children at the library
Mathematics
1 answer:
GrogVix [38]3 years ago
5 0
Remaining children = 20-6=14 
So 14 children have age of 8 years old.

Average age = (6*5+14*8)/20 ≈ 7.1 ≈ 7 years old
You might be interested in
What math do high schoolers learn? Do they only learn trigonometry, geometry and equations?
EleoNora [17]

Answer:

trigonometry

Step-by-step explanation:

hopes this helps

8 0
2 years ago
Read 2 more answers
Martha and sarah leave block p and q towards q and p respectively simultaneously and travel in the same route. After meeting eac
olga_2 [115]

The average speed of Martha and Sarah is 32 km/h.

We need to know about the speed to solve this problem. Speed can be determined as the distance traveled divided by time. It can be written as

v = s / t

where v is speed, s is distance and t is time.

From the question above, we know that:

t sarah = 3 hours

t martha = 5 hours

v sarah = 40 km/h

By using the speed equation, we get the distance

vsarah = s / tsarah

40 = s/3

s = 120 km

Find Martha's speed

vmartha = s / tmartha

vmartha = 120 / 5

vmartha = 24 km/h

Find average speed

v = (vsarah + vmartha)/2

v = (40 + 24) / 2

v = 32 km/h

Hence, the average speed of Martha and Sarah is 32 km/h.

Find more on speed at: brainly.com/question/6504879

#SPJ4

5 0
1 year ago
Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the zeros −3 and 5
love history [14]

Answer:

<em>f(x) = x² (2+i)x-15-3i</em>

Step-by-step explanation:

Since the zeros of the equation are -3 and 5+i, hence the factors of the polynomial in x is (x+3) and (x-(5+i))

Multiplying both factors

f(x) =  (x+3)(x-(5+i))

f(x) = (x²-(5+i)x+3x -3(5+i))

f(x) = x² - (5+i- 3)x -15-3i

f(x) = x² (2+i)x-15-3i

<em>hence the required polynomial function in x is f(x) = x² (2+i)x-15-3i</em>

7 0
3 years ago
In a hypothesis test, standard error measures ____.
Lina20 [59]

Answer:

The correct answer is:

the amount of difference expected just by chance (b)

Step-by-step explanation:

Standard error in hypothesis testing is a measure of how accurately a sample distribution represents a distribution by using standard deviation. For example in a population, the sample mean deviates from the actual mean, the mean deviation is the standard error of the mean, showing the amount of difference between the sample mean and the actual mean, occurring just by chance. Mathematically standard error is represented as:

standard error = (mean deviation) ÷ √(sample size).

standard error is inversely proportional to sample size. The larger the sample size, the smaller the standard error, and vice versa.

7 0
3 years ago
5+3x write in verbal expression
Keith_Richards [23]

Answer:

Five plus free equals 7

Step-by-step explanation:

I added five plus three

5 0
2 years ago
Read 2 more answers
Other questions:
  • 2x-7y=12 for y answer please​
    13·2 answers
  • Jesse has 5 and 3/4 dozen eggs. How many eggs does he have.
    14·1 answer
  • An arithmetic sequence has a first term of 3 and a fifth term of 31 what is it’s second term
    9·2 answers
  • Help in geometry with work and answer please
    9·1 answer
  • Which expression is equivalent to 12x + 20y?
    7·1 answer
  • 1) Find mZLMN if mZLMT= 23°<br> and mZTMN = 144º.
    15·1 answer
  • Solve each system by eliminating one of the variables by addition or<br> subtraction.
    14·1 answer
  • Carrie has $10 in a savings account. The interest rate is 10%, compounded annually.
    7·1 answer
  • Please help me with this function graph ​
    8·1 answer
  • Draw a line representing the “rise” and a line representing the “run” of the line. State the slope of the line in simplest form.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!