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kogti [31]
2 years ago
11

Matilda needs at least $112 to buy a new dress. She has already saved $40. She earns $9 an hour babysitting. Write and solve an

inequality to find how many hours she will need to babysit to buy the dress. Interpret the solution.
Mathematics
2 answers:
nikitadnepr [17]2 years ago
7 0
This is how many hours you will need 5 hours
Dennis_Churaev [7]2 years ago
4 0

she will need two more hours to buy the dress

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It is important that face masks used by firefighters be able to withstand high temperatures because firefighters commonly work i
Salsk061 [2.6K]

Answer:

(-\infty, 0.2661)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

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".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

n=60 represent the sample size  

X=12 represent the number of masks that had lenses pop out at 250°

\hat p =\frac{12}{60}=0.2 represent the estimated proportion of masks that  had lenses pop out at 250°

p represent the population proportion of masks that  had lenses pop out at 250°

Confidence =0.9 or 90%

\alpha=0.1 represent the significance level

Confidence interval

On this case we want a interval on this form : (-\infty,\hat p +z_{\alpha}\sqrt{\frac{\hat p (1-\hat p)}{n}})

So the critical value would be on this case z_{\alpha}=1.28 and we can use the following excel code to find it: "=NORM.INV(1-0.1,0,1)"

We found the lower limit like this:

0.2 +1.28\sqrt{\frac{0.2 (1-0.2)}{60}}=0.2661

And the interval would be: (-\infyt, 0.2661)

3 0
3 years ago
A shirt is on sale for 40% off. <br> The sale price is $12. What<br> is the original price?
____ [38]
The original price is $30 because 40% off of 12 = 30
8 0
2 years ago
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What is the minimum amount of money i should be making per hour for 40 hours a week to have an income of $ 37,500 a year?
statuscvo [17]

Answer:

$18.03  to nearest cent

Step-by-step explanation:

There are 52 weeks in the year so the weekly income =  $37,500 / 52

So for a 40 hours week  hourly pay =  37,500 / (52 * 40)

=  $18.03  to nearest cent

5 0
2 years ago
The scatter plot shows the study time and test scores for the students in Mrs. Johnson's English Literature class.
kati45 [8]

Answer:

b

Step-by-step explanation:

5 0
3 years ago
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Will you help out with this equation please
Rina8888 [55]
If that says 4v=3 and 2/3, then v =11/12
4 0
2 years ago
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