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3 years ago

230x230 helppppppppppppppppp

Mathematics

2 answers:

Kipish [7]3 years ago

6 0

Answer:

230x230= 52,900

enot [183]3 years ago

5 0

Answer:

52900

Step-by-step explanation:

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A supplier of a certain car parts chain of stores wants to estimate the average length of time car owners plan to keep their car

____ [38]

Answer:

The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 2.575*\frac{6.5}{\sqrt{25}} = 3.35$

The lower end of the interval is the sample mean subtracted by M. So it is 7.2 - 3.35 = 3.85 years

The upper end of the interval is the sample mean added to M. So it is 7.2 + 3.35 = 10.55 years

The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.

7 0

3 years ago

The average walking speed r of a person living in a population P in thousands is modeled by the function, r(p) = 0.37 ln p + 0.0

Veseljchak [2.6K]

Answer:

The average walking speed is 1.48 feet per second

Step-by-step explanation:

we have

$r(p)=0.37ln(p)+0.05$

where

r is average walking speed

p is the population in thousands

In this problem we have

$p=48,000/1,000=48$ ----> because p in the equation is in thousands

substitute the value of p in the equation

$r(p)=0.37ln(48)+0.05$

using a calculator

$r(p)=1.48\ ft/sec$

4 0

3 years ago

Simplify the product.

liberstina [14]

The value of the product expression is –6p^3 + 8p^2 – 10p

<h3>How to simplify the product?</h3>

The product expression is given as:

2p(–3p2 + 4p – 5)

Rewrite properly as:

2p(–3p^2 + 4p – 5)

Remove the bracket

2p * –3p^2 + 2p * 4p – 2p * 5

Evaluate the products

–6p^3 + 8p^2 – 10p

Hence, the value of the product expression is –6p^3 + 8p^2 – 10p

Read more about expression at

brainly.com/question/4541471

#SPJ1

6 0

2 years ago

A biologist recorded a count of 337 bacteria present in a culture after 5 minutes and 699 bacteria present after 15 minutes.

hoa [83]

The initial population was 234.

<em><u>Explanation</u></em>

<u>Formula for the exponential growth</u> is: $A= P*e^r^t$ , where P is the initial amount, A is the final amount, r is the rate of growth and t is the time duration.

There was 337 bacteria after 5 minutes and 699 bacteria after 15 minutes. So, the equations will be......

$337=P*e^5^r .................................. (1)\\ \\ 699=P*e^1^5^r ................................. (2)$

Now dividing equation (2) by equation (1) , we will get .......

$\frac{699}{337}=\frac{e^1^5^r}{e^5^r} \\ \\ e^1^0^r = \frac{699}{337}$

<u>Taking 'natural log'</u> on both sides.........

$ln (e^1^0^r) = ln (\frac{699}{337})\\ \\ 10r= 0.7295....\\ \\ r= 0.07295.... \approx 0.073$

Now, plugging this $r=0.073$ into equation (1), we will get......

$337= P*e^5^(^0^.^0^7^3^)\\ \\ 337= P*1.4405 \\ \\ P= 233.946 \approx 234$

So, the initial population was 234.

7 0

3 years ago

Which point is a reflection of (1.5, -4.5) across the x-axis and the y-axis?

algol [13]

Answer:

A.Point

Step-by-step explanation:

7 0

3 years ago

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