For every pound a company spends on advertising, it spends 43 pence

the first group of students consists of 10 and their average age was 13 years old the next group consisted of 30 students and th

Kazeer [188]

Answer: The average was 9 years old find the average age of both groups is 10 years old.

Step-by-step explanation:

Formula foe average : $\text{Average} =\dfrac{\text{Sum of all observations}}{\text{Number of observations}}$

Given : The first group of students consists of 10 and their average age was 13 years old.

i.e. $13=\dfrac{\text{Sum of ages of students of first group}}{10}\\\\\Rightarrow\ \text{Sum of ages of students of first group}=13\times10=130$ (1)

The next group consisted of 30 students and their average was 9 years old.

i.e. $9=\dfrac{\text{Sum of ages of students of next group}}{30}\\\\\Rightarrow\ \text{Sum of ages of students of nextgroup}=9\times30=270$ (2)

Then from (1) and (2) , the sum of both groups (first group and next group )students = 130+270 =400

Combined students of both groups (first and next group )= 10+30=40

Now , the average of both groups = $\dfrac{\text{Sum of combined students}}{\text{combined students}}$

$=\dfrac{400}{40}=10$

Hence, the average was 9 years old find the average age of both groups is 10 years old.

4 0

3 years ago

ANSWER CORRECTLY WITH REASONING FOR BRAINLIEST

Vadim26 [7]

Answer:false

Step-by-step explanation:because jaya is not giving her opinion she is asking for others opinions.

4 0

3 years ago

Heidikae reads 420 pages a week. In the summer, she reads 17% less. Approximately how many pages per week does she read in the s

Marat540 [252]

420-17%= 348.6

This is it because she read 420 pages during the summer but then she reads 17% less which is subtracting then get the answer which is 348.6

8 0

3 years ago

Arrange your bookshelf with equal books In each row for a stack of 49 books.Decide if 49 is a prime number or a composite number

mixas84 [53]

49 is not a prime number, 7*7 is 49 so if you have 7 selves you can fit 7 books on to each self

6 0

3 years ago

The graph shows the function f(x) which equation represents f(x)?

Elan Coil [88]

Some times it's really very easy to answer the problem just by looking over the given problem.

For the given graph, we need to observe some(or any) point on the graph that can conclude anything to answer the given problem.

Generally we observe x or y-intercepts of the graph first.

Let us observe the y-intercept of the given graph, because we can see a clear picture of y-intercept there.

By looking on the graph, we can see y-intercept is at -1.

Note: y-intercept is a point on y-axis where value of x is 0.

Now let us observe the given functions in the given options.

First option: If we plug x=0 in the given function, we get f(0)=0.

So, y-intercept for first option is 0.

Second option: If we plug x=0, we get a negative -1 inside radical. Cube root of -1 is -1. On multiplying by -1 we get +1.

So, y-intercept for second option is 1.

Third option : If we plug x=0 in that function, we get 0-1 = -1.

So, the y-intercept for third function is -1.

Therefore, function in third option is the correct function for given graph.

Therefore, third option $f(x)=\sqrt[3]{-x}-1$ is correct option.

3 0

3 years ago

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