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3 years ago

13

a carpet store has 4 commercials every hour on a local television station how many commercials will the store have in 233 hours?

1 answer:

LuckyWell [14K]3 years ago

3 0

Answer:

932

Step-by-step explanation:

If they have 4 every hour, and there's 233 hours, you multiply 233 by 4.

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Adam is x years old. His father is 25 years older than Adam. His brother is 3 years younger than Adam. The brothers' ages added

djyliett [7]

F=x+25
b=x-3
x+b=25

b) x-3 +x =25
2x=25+3
x=28÷2
x=14
b= 11
f= 39

5 0

3 years ago

Read 2 more answers

The Highway Safety Department wants to study the driving habits of individuals. A sample of 32 cars traveling on the highway rev

GarryVolchara [31]

Answer:

n=126

Step-by-step explanation:

Data given and previous concepts

$\bar X=60$ represent the sample mean

$s=11$ represent the sample deviation

n=32 represent the sample size

Confidence =0.95 or 95%

$\alpha =1-0.95=0.05$ represent the significance level

ME= 2 represent the margin of error required

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Assuming the X follows a normal distribution

$X \sim N(\mu, \sigma)$

Solution to the problem

Since we don't have the population deviation. We know that the margin of error for a confidence interval is given by:

$Me=t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The next step would be find the value of $\t_{\alpha/2}$ , $\alpha=1-0.95=0.05$ and $\alpha/2=0.025$ . The degrees of freedom are given by:

$df=n-1=32-1=31$

Using the normal standard table, excel or a calculator we see that:

$t_{\alpha/2}=2.04$

And the code in excel is this one: "=T.INV(1-0.025,31)"

If we solve for n from formula (1) we got:

$\sqrt{n}=\frac{t_{\alpha/2} s}{Me}$

$n=(\frac{t_{\alpha/2} s}{Me})^2$

And we have everything to replace into the formula:

$n=(\frac{2.04(11)}{2})^2 =125.88$

And if we round up the answer we see that the value of n to ensure the margin of error required $\pm=2 miles$ is n=126.

3 0

3 years ago

A school club has ordered a box of 50 booklets for a fundraiser. Unfortunately, 10 of the booklets are missing several pages. A

Airida [17]

Answer:

50%

Step-by-step explanation:

4 0

2 years ago

The quotient of a number and -5 increased by one is at most 7. please need hellp

zvonat [6]

Answer:

<h2>n ≥ -40</h2>

Step-by-step explanation:

$n-\text{a number}\\\\\text{the quotient of a number and - 5}\to n:(-5)=-\dfrac{n}{5}\\\\\text{the quotient of a number and -5 increased by one}\to-\dfrac{n}{5}-1\\\\\text{the quotient of a number and -5 increased by one is at most 7}:\\\\-\dfrac{n}{5}-1\leq7\qquad\text{add 1 to both sides}\\\\-\dfrac{n}{5}-1+1\leq7+1\\\\-\dfrac{n}{5}\leq8\qquad\text{multiply both sides by 5}\\\\5\!\!\!\!\diagup\cdot\left(-\dfrac{n}{5\!\!\!\!\diagup}\right)\leq(5)(8)\\\\-n\leq40\qquad\text{change the signs}\\\\n\geq-40$

8 0

3 years ago

The equation S = 50 + 45w represents the savings, S, after w weeks working and

ziro4ka [17]

Answer:

yes

Step-by-step explanation:

50 can be the initial money in the account and she can be depositing 45 dollars every (w) weeks and it will show her (S) savings

7 0

3 years ago