3 years ago

Two numbers sum 54, twice the first subtracted from the second is 9

Mathematics

1 answer:

Rudik [331]3 years ago

6 0

Answer:

21,33

Step-by-step explanation:

x+y=54

2x-y=9

3x=63

x=21

You might be interested in

A random sample of 8 recent college graduates found that starting salaries for architects in New York City had a mean of $42,653

ycow [4]

Answer:

C. (36337.32, 48968.68)

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.96*\frac{9114}{\sqrt{8}} = 6315.68$

The lower end of the interval is the sample mean subtracted by M. So it is 42653 - 6315.68 = 36337.32.

The upper end of the interval is the sample mean added to M. So it is 42653 + 6315.68 = 48968.68.

So the correct answer is:

C. (36337.32, 48968.68)

3 0

3 years ago

How much oil wells in a given field will ultimately produce is key information in deciding whether to drill more wells. Data was

Ugo [173]

Answer:

Check the explanation

Step-by-step explanation:

Kindly check the attached image below to see the step by step explanation to the question above.

3 0

4 years ago

N the drawing, six out of every 10 tickets are winning tickets. Of the winning tickets, one out of every three awards is a large

MaRussiya [10]

the answer would be one-fifth :)

hope this helped

5 0

3 years ago

Read 2 more answers

The functions f(x) = (x + 1)2 − 2 and g(x) = -(x − 2)2 + 1 have been rewritten using the completing-the-square method. Is the ve

Ksenya-84 [330]

Answer:

The negative outside the parentheses indicates that the vertex is a maximum

f(x) has a minimum vertex

g(x) has a maximum

Step-by-step explanation:

7 0

3 years ago

Can anyone please help me please

Rashid [163]

Answer:

this isnt spanish

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers