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3 years ago

PLEASE CHECK PLS HELP AND FIND ANSWER

Mathematics

1 answer:

kari74 [83]3 years ago

6 0

Here:

PFA for the answers. The numbering might confuse you. It goes from the 1 to the last marked question in ascending order. Hope it helps you. ~BYE

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5x - y + z = -6<br> 2x + 7y + 3z = 8<br> x + 2z = 6

BabaBlast [244]

Answer:

Step-by-step explanation:

The system of equations given are:

5x - y + z = -6 ------------- i

2x + 7y + 3z = 8 ---------- ii

x + 2z = 6 ----------------- iii

Let us deal with equation i and ii first since they have 3 variables x, y and z;

5x - y + z = -6 x 7

2x + 7y + 3z = 8 x 1

35x - 7y + 7z = -42 ---- iv

2x + 7y + 3z = 8 ---- v

Add equation iv and v;

37x + 10z = -34 ------vi

So, let us solve equation vi and iii:

x + 2z = 6 - ---------- iii x 10

37x + 10z = -34 --- iv x 2

10x + 20z = 60 vi

74x + 20z = -68 vii

Subtract vi - vii;

-64x = 128

x = -2

So; put x = -2 into iii;

x + 2z = 6

-2 + 2z = 6

2z = 6 + 2 = 8

z = 4

Put x = -2 and z = 4 into equation i;

5(-2) - y + 4 = - 6

-10 -y +4 = -6

-6 - y = -6

-y = 0

y = 0

5 0

3 years ago

Jim has to travel 3 kilometers to meet his friend. From his friend's house, Jim walks to the gym, which is 100 meters farther do

AVprozaik [17]

Answer:

3.1 kilometers

Step-by-step explanation:

Mark me as brainliest if this helps!

4 0

3 years ago

Read 2 more answers

Joandid 5/6 a load of laundry on Wednesday and 1/6 a load on Thursday the first load was 3/4 colored clothes.What fraction of la

Llana [10]

It would be one whole since 5/6 + 1/6 equals 1

6 0

4 years ago

Read 2 more answers

Find the value of x in each case. PLEASE SHOW WORK!!!

myrzilka [38]

$m\angle BCA=180^o-5x$

$\angle CAB=\angle ACD\\\\m\angle CAB=33^o$

In the triangle ABC:

$m\angle ABC+m\angle BCA+m\angle CAB=180^o\\\\2x+180^o-5x+33^o=180^o\\\\-3x+213^o=180^o\ \ \ |-213^o\\\\-3x=-33^o\ \ \ |:(-3)\\\\x=11^o$

4 0

3 years ago

Find the 95% confidence interval for estimating the population mean μ

AVprozaik [17]

We first need to determine whether we are dealing with means or proportions in this problem. Since we are given the sample and population mean, we know that we are dealing with means.

Since we have one sample mean, this means we are creating a confidence interval for one sample (1 Samp T Int).

Normally we would check for conditions, but since this is not formulated as a "real-world scenario" type problem, it is hard to check for randomness and independence. Therefore, I will be excluding conditions from this answer.

<h3>Confidence Interval Formula</h3>

The formula for constructing a <u>confidence interval for means</u> is as follows: