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3 years ago

Help me please And thank you

Mathematics

2 answers:

irina1246 [14]3 years ago

6 0

The answer is A hopes this helps :)

valkas [14]3 years ago

4 0

Answer:

The correct option is A.

Step-by-step explanation:

Sample size(n)= 196

Sample mean = 12 ug/m³

Standard deviation (s)= 3.5 ug/m³

The formula for confidence interval is

$C.I=\bar{x}\pm z^*\times \frac{s}{\sqrt{n}}$

Where, $\bar{x}$ is sample mean, s is sample standard deviation, n is sample size and z* is z-score at given confidence limit.

The value of z-score at 99.7% is 3.

$C.I=12\pm 3\times \frac{3.5}{\sqrt{196}}$

$C.I=12\pm 0.75$

$C.I=[12-0.75,12+0.75]$

$C.I=[11.25,12.75]$

The required solution is 11.25 ug/m³ - 12.75 ug/m³.

Therefore the correct option is A.

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What is the final amount if 1235 is increased by 4% followed by a 4% decrease?

NikAS [45]

Answer:

Step-by-step explanation:

Because firstly, it is increased by 4% but tge same is followed by a 4% decrease. So the final amount will be 1235

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2 years ago

Is (4,9) a solution to this system of inequalities? y < x + 3 and y > 2x + 1

Setler79 [48]

No

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2 years ago

A rectangular room is 3 meters longer than it is wide, and its perimeter is 22 meters. Find the dimension of the room. The lengt

lyudmila [28]

Answer:

Width = 4 m

Length = 7 m

Step-by-step explanation:

given:

perimeter of a rectangle = 22m

L = 3 + W

perimeter = 2L + 2W

perimeter = 2 (3 + W) + 2W

22 = 6 + 2W + 2W

22 - 6 = 4W

W = 16 / 4

W = 4 m

L = 3 + W

L = 3 + 4

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check:

perimeter = 2L + 2W

22 = 2(7) + 2(4)

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4 0

3 years ago

Find any points of discontinuity for each rational function. Sketch a graph. Describe any verticals or horizontal asympyoyes and

AVprozaik [17]

For
y = (x^2 -4)/((x +2)(x^2 -49))
the numerator factors to (x -2)(x +2), so the factor of (x +2) will cancel with that in the denominator, leaving
y = (x -2)/(x^2 -49)

There are points of discontinuity at the hole, x=-2, and at each of the vertical asymptotes, at x=-7, +7.
The horizontal asymptote is y=0.

5 0

3 years ago

HELP!!!!!!!!!!!!!!!!!!!!! Do all real numbers have a decimal expansion? Select each correct answer. Some numbers, such as 1 10

ankoles [38]

Answer:

1. Some numbers, such as $\frac{1}{10}$ , have a decimal expansion that terminates.

2. All real numbers have a decimal expansion.

5. Some numbers, such as $\frac{1}{18}$ , have a decimal expansion that repeats but does not terminate.

Step-by-step explanation:

According to the options, we have,

1. Some numbers, such as $\frac{1}{10}$ , have a decimal expansion that terminates.

It is correct as the decimal expansion of $\frac{1}{10}$ is 0.1, which terminates.

2. All real numbers have a decimal expansion.

This is also correct as both rational and irrational numbers can be written in decimal form.

3. Some numbers, such as $\sqrt{13}$ do not have a decimal expansion

This is not correct as $\sqrt{13}=3.605551275$ i.e. it has a decimal expansion.

4. Only some real numbers have a decimal expansion.

It is not correct as 2 is correct.

5. Some numbers, such as $\frac{1}{18}$ , have a decimal expansion that repeats but does not terminate.

It is correct as $\frac{1}{18}=0.0555555..$ , which is non-terminating decimal expansion.

So, the correct options are,

1. Some numbers, such as $\frac{1}{10}$ , have a decimal expansion that terminates.

2. All real numbers have a decimal expansion.

5. Some numbers, such as $\frac{1}{18}$ , have a decimal expansion that repeats but does not terminate.

6 0

3 years ago