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Nat2105 [25]
3 years ago
5

X²- 49=0 what is the answer is for my exam? Thanks to the one who helps me has 10 points​

Mathematics
2 answers:
Nikitich [7]3 years ago
8 0

Step-by-step explanation:

<em>x² - 49 = 0 </em>

<em>or, x² - (7²) = 0</em>

<em>or, ( x + 7 ) ( x - 7 ) = 0</em>

<em>hope</em><em> </em><em>this</em><em> </em><em>answer</em><em> </em><em>will</em><em> </em><em>help</em><em> </em><em>you</em><em>. </em>

kirill [66]3 years ago
5 0
Factor the expression
(x - 7)(x + 7) = 0
Zero product property
Solution: x = 7, x = -7
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NEED HELP BEING TIMED
Virty [35]

Answer:

The answer is A.

The value of the 1 in the one's place is 10 times​ the value of the 1 in the tenths place.

Step-by-step explanation:

7 0
3 years ago
In a sample of eight whitefish caught in Yellowknife Bay, the mean arsenic concentration in the liver was 0.32 mg/kg, with a sta
Advocard [28]

Answer:

The 95% confidence interval for the concentration in whitefish found in Yellowknife Bay is (0.2698 mg/kg, 0.3702 mg/kg).

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 8 - 1 = 7

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 7 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.3246

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.3646\frac{0.06}{\sqrt{8}} = 0.0502

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 0.32 - 0.0502 = 0.2698 mg/kg

The upper end of the interval is the sample mean added to M. So it is 0.32 + 0.0502 = 0.3702 mg/kg

The 95% confidence interval for the concentration in whitefish found in Yellowknife Bay is (0.2698 mg/kg, 0.3702 mg/kg).

8 0
2 years ago
What is the area of the square?<br> 2 m<br> square meters
Mariulka [41]

Answer:

4m

Step-by-step explanation:

the ratio to find a square’s area is <em>side length</em> times <em>side length</em>, i.e.

sl * sl = a

2m * 2m = 4m

hope this helps!

5 0
2 years ago
Read 2 more answers
Plz need answers by today
cestrela7 [59]

Answer:

the 2

Step-by-step explanation:

7 0
3 years ago
The sum of all but one interior angle of a heptagon is 776°. what is the measure of the final interior angle? 42º 56º 124º 304º
Mekhanik [1.2K]

A heptagon has seven sides. The measure of the final interior angle of the heptagon is 124°.

<h3>What is heptagon?</h3>

A heptagon, sometimes known as a septagon, is a seven-sided polygon. The heptagon is also known as the septagon, which combines the prefix "sept-" with the Greek suffix "-agon," which means "angle."

A heptagon has 7 sides therefore, the sum of the interior angle of the heptagon can be written as,

\text{Sum of intetrior angles of a polygon with n sides} = (n-2)\times 180^o\\\\\text{Sum of all the angle of heptagon} = (7-2) \times 180^o = 900^o

As it is said in the problem that the sum of the all the angles of the heptagon  except one is 776°, therefore, the measure of the last angle of the heptagon is,

The measure of the last angle = 900° - 776° = 124°

Hence, the measure of the final interior angle of the heptagon is 124°.

Learn more about Heptagon:

brainly.com/question/12630702

3 0
2 years ago
Read 2 more answers
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