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allsm [11]
3 years ago
9

7x - 3y = 42x - 4y = 1the solution to the system of equations is _____.

Mathematics
1 answer:
Mars2501 [29]3 years ago
4 0
7x - 3y = 4
2x - 4y = 1

Multiply the first equation by 4.
Multiply the second equation by -3

28x - 12y = 16
-6x + 12y = -3

Now add the equations.

22x = 13

x = 13/22

Now substitute x = 13/22 in the first original equation and solve for y.

7 * 13/22 - 3y = 4

91/22 - 3y = 88/22

-3y = -3/22

y = 1/22

Answer: x = 13/22, y = 1/22

y = 3/22
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Gemiola [76]
Liam can make 7 party favors.
5 0
3 years ago
5 tins of soup have a total weight of 1750 grams.
WITCHER [35]

Answer:

30 grams

Step-by-step explanation:

So, first I had to figure out what 1 tin weight. Which was 350 grams because I divide 5 into 1750. Then I did 350+4 which gave me 1,400. I knew that there was three packets so 30 grams per packet should be the answer because 30×3 is 90 grams.

4 0
3 years ago
To increase the value of estimated Cohen's d, a researcher increases the sample size. Will this change the value of d?
tatyana61 [14]

Answer:

a. A) Yes; as sample size increases, effect size increases.

b. A) The critical value increases.

Step-by-step explanation:

a.

If all possible samples of size N are drawn from a finite population, Np, without replacement, and the standard deviation of the mean values of the sampling distribution of means is determined then:

σx =d  √N

d = σx . √N

d ∞ N

from this, we can say d is directly proportional to √N

where σx is the standard deviation of the sampling distribution of  means and d is the standard deviation of the population’. The standard deviation of a sampling distribution of mean values is called the standard error of the means,

therefore, we can conclude that:

A) Yes; as sample size increases, effect size increases.

b.

In this estimate, tc is called the confidence coefficient for small samples,  d is the standard deviation of the sample, x is the mean value of the sample and N is the number of members in the sample.

When determining the t-value, given by

t =( (x−µ) /s) * \sqrt{N-1}

it is necessary to know the sample parameters x and s and the population parameter µ. x and s can be calculated for the sample, but usually an estimate has to be made of the population mean µ, based on the sample mean value.

from the above equation it can be deduced that t value is determined with the sample size, and as the sample size increases

A) The critical value increases.

3 0
3 years ago
Divide. Reduce the answer to lowest terms.<br> 3/8 divided by 1/7
fredd [130]
<h3>Answer:</h3>

2 \frac{5}{8}, or \frac{21}{8}

<h3>Explanation:</h3>

Use the Keep Change Flip method.  Change the sign to multiplication and flip the second fraction.  \frac{3}{8}*\frac{7}{1}

Multiply the numerators and the denominators separatley.  \frac{3*7}{8*1}=\frac{21}{8}

This cannot be simplified further, but it can be converted to a mixed number (as opposed to an improper fraction).  \frac{21}{8}=2 \frac{5}{8}

5 0
3 years ago
Read 2 more answers
Please help I need help ASAP!!!!
anzhelika [568]

Answer:

180

Step-by-step explanation:

8 0
3 years ago
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