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3 years ago

PLEASE HELP VERY DESPREAT

Mathematics

2 answers:

inysia [295]3 years ago

4 0

Answer: 2.50

Step-by-step explanation

we need to divide dollars / kilogram

hammer [34]3 years ago

4 0

Answer:

Step-by-step explanation:

X + 55 + 100 = 180

X = 180 - 100 - 55

X = 25°

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Find the equation of line that passes through the points: A(2,3) and B(4,6)

valentinak56 [21]

Answer:

Step-by-step explanation:

Hello : let A(2,3) B(4,6)

the slope is : (YB - YA)/(XB -XA)

(6-3)/(4-2) = 3/2

an equation is : y=ax+b a is a slope

y = (3/2)x +b

the line through point (2,3) : 3 = (3/2)(2)+b

b = 0

the equation is : y =(3/2)x

8 0

3 years ago

[2(3+5)-2(4+1)]5 what is the value?

Jet001 [13]

[2(3+5)-2(4+1)]5
=[2(8)-2(5)]5
=[16-10]5
=6*5
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7 0

3 years ago

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"A cable TV company wants to estimate the percentage of cable boxes in use during an evening hour. An approximation is 20 percen

Marizza181 [45]

Answer:

The company should take a sample of 148 boxes.

Step-by-step explanation:

Hello!

The cable TV company whats to know what sample size to take to estimate the proportion/percentage of cable boxes in use during an evening hour.

They estimated a "pilot" proportion of p'=0.20

And using a 90% confidence level the CI should have a margin of error of 2% (0.02).

The CI for the population proportion is made using an approximation of the standard normal distribution, and its structure is "point estimation" ± "margin of error"

[p' ± $Z_{1-\alpha /2} * \sqrt{\frac{p'(1-p')}{n} }$ ]

Where

p' is the sample proportion/point estimator of the population proportion

$Z_{1-\alpha /2} * \sqrt{\frac{p'(1-p')}{n} }$ is the margin of error (d) of the confidence interval.

$Z_{1-\alpha /2} = Z_{1-0.05} = Z_{0.95}= 1.648$

$d= Z_{1-\alpha /2} * \sqrt{\frac{p'(1-p')}{n} }$

$d *Z_{1-\alpha /2}= \sqrt{\frac{p'(1-p')}{n} }$

$(d*Z_{1-\alpha /2})^2= \frac{p'(1-p')}{n}$

$n*(d*Z_{1-\alpha /2})^2= p'(1-p')$

$n= \frac{p'(1-p')}{(d*Z_{1-\alpha /2})^2}$

$n= \frac{0.2(1-0.2)}{(0.02*1.648)^2}$

n= 147.28 ≅ 148 boxes.

I hope it helps!

3 0

3 years ago

A calculus exam has a mean of µ = 73 and a standard deviation of σ = 4. Trina's score on the exam was 79, giving her a z-score o

kirza4 [7]

Answer:

I get z = +1.8

x= 79

m= 73;s= 4;z= (x-m)/s= 1.5

hope it helps you

7 0

3 years ago

Aurora has a cell phone plan that charges $65 for phone service plus $12 for eachgigabyte of data used each month. If her bill f

Ivahew [28]

Answer:

4 gigabytes

Step-by-step explanation:

64+12+12+12+12=113

7 0

3 years ago

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