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4 years ago

What is r+(−5r) simplified?

Mathematics

1 answer:

mestny [16]4 years ago

3 0

Answer:

-4r

Step-by-step explanation:

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The population of a city is currently 45,000 and is declining at a rate of 2% each year. Give a formula for determining the tota

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3 years ago

What is the least integer value in the solution set to 7(3x – 1) ≤ 4x? –1 2 3 7

Ahat [919]

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Step-by-step explanation: just took the quiz on edge

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3 years ago

What is the factored form of this expression? 9x2 – 64y2

NARA [144]

Answer:

(3x + 8y)(3x - 8y)

Step-by-step explanation:

this is the difference of 2 perfect squares.

9x2 - 64y2

(3x + 8y)(3x - 8y)

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3 years ago

The Chen family sold its house through a real estate agent for $330,000. If the real estate agent gets a 4.5% commission, how mu

Galina-37 [17]

Answer:

Step-by-step explanation:

1.first 330,000 divided by 100 wich Is 3300 then multiply that by 4 wich is 13,200

2. then 330,000 divided by 1000 wich is 330 multiply that by 5 wich is 1,650

3. Add 1,650 + 13,200 + 330,000 wich is 344,850.00 so a

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4 years ago

A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtain

Ivanshal [37]

Answer:a-396

b-420

Step-by-step explanation:

$\alpha$ =0.1

Margin of Error=0.04

Level of significance is z $\left ( 0.1\right )=1.64$

Previous estimate $\left ( p\right ) =0.38$

sample size is given by:

n= $\left (\frac{Z_{\frac{\alpha }{2}}}{E}\right )p\left ( 1-p\right )$

n= $\frac{1.64}{0.04}^{2}0.38\left ( 1-0.38\right )=396.0436\approx 396$

$\left ( b\right )$ Does not use prior estimate

Assume

$\alpha$ =0.1

Margin of Error=0.04

Level of significance is z $\left ( 0.1\right )=1.64$

Population proportion $\left ( p\right )$ =0.5

n= $\left (\frac{Z_{\frac{\alpha }{2}}}{E}\right )p\left ( 1-p\right )$

n= $\frac{1.64}{0.04}^{2}0.5\left ( 1-0.5\right )$

n=420.25 $\approx 420$

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3 years ago