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2 years ago

5x -2x +6x +40 -9 +1 -x +3x -8 +15x +7

Mathematics

1 answer:

creativ13 [48]2 years ago

4 0

X=28582 that is the sender

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Solve for x: 2x + 3 + (-1) = x + 5

faust18 [17]

Answer:

x=3

Step-by-step explanation:

2x-x=5-3+1

x=3

I think that's it

5 0

3 years ago

"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

Factor completely 3bx^2 - 9x^3 - b + 3x

Anna11 [10]

Factor out the common terms in the first two terms, then in the last two terms;

3x^2(b - 3x) - (b - 3x)

Factor out the common term b - 3x

5 0

3 years ago

Andre is planning on installing wood flooring in his kitchen and hallway. The cost of the wood flooring is $6.59 per square foot

kati45 [8]

Answer:

Expect the install range to be from $5 to $8 per square foot. This includes labor to remove your previous flooring, installation and finishing of the hardwood. Flooring companies typically quote the cost to install a hardwood floor on a square-foot basis.

Step-by-step explanation:

3 0

3 years ago

Which represents an exterior angle of triangle ABF

andreyandreev [35.5K]

Answer:BAD AFE CAD CAB

Step-by-step explanation:

3 0

3 years ago

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