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NeX [460]
3 years ago
7

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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Please explain how to do this system of equations 2y=6x+10 y=2x+4
Serjik [45]

Answer:

x=-1, y=2

Step-by-step explanation:

Given:

2y=6x+10

y=2x+4

Substitution for y into first equation:

2(2x+4)=6x+10

4x+8=6x+10

0=2x+2

2x=-2

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4 0
2 years ago
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x=2 and y=1

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3 years ago
Determine the angular velocity, in radians per second, of 14.2 revolutions in 8 seconds
adoni [48]
To answer this item, we use dimensional analysis and conversion factor, 1 revolution is equal to 2π rad. Using the concept and the given,
            
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8 0
3 years ago
A LOT OF POINTS pls help and answer correctly if not I will report ty asap !
Solnce55 [7]

Answer:

hey

Step-by-step explanation:

to calculate perimeter, you require length,breadth

since points are given,find distance between points using distance formulae

<h2>root over (x2-x1)² +(y2-y1)²</h2>

______________________

<h3>Point H =(6,7)</h3><h3>Point I=(-6,-9)</h3><h3>Point J=(-10,-6)</h3><h3>Point G=2,10)</h3>

Now find distance between HI and IJ

HI gives the distance - length of rectangle

IJ gives the distance - breadth of rectangle

use the formulae ,2(length+breadth) to get perimeter

______________________

HI= root over 144+256= root 400

HI=20

IJ= root over 16+9= root 25

IJ=5

PERIMETER =2(20+5)

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3 years ago
Daniel calculated that the circumference of his motorcycle tire is 62.8 inches. What is the tire's radius? Use 3.14 for ​pi.
Savatey [412]
R=19.98 In by dividing
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3 years ago
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