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lesantik [10]
3 years ago
5

Can I please have help with numbers 28 and 30 and can you check if I got number 29 correct? THANK YOU

Mathematics
1 answer:
sweet [91]3 years ago
6 0
28 is B 
30 is C and 
29 is correct as it is!
Hope this helps.
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PLEASE HELP I WILL GIVE BRAINALIST
RideAnS [48]

Answer:

They each paid $40

Step-by-step explanation:

please give brainliest

3 0
2 years ago
How to do 200 + 1 and 1/2 x equals 548 - 1 and 2/5 x
eimsori [14]
So to do this you have to first calculate the sum subtract, multiply both sides by 10, move the terms, and collect like terms. So X=3460 I believe

Your welcome
5 0
3 years ago
A quality control expert wants to estimate the proportion of defective components that are being manufactured by his company. A
tigry1 [53]

Answer:

A sample of 1032 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

A sample of 300 components showed that 20 were defective.

This means that \pi = \frac{20}{300} = 0.0667

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 99% confidence?

A sample of n is needed.

n is found when M = 0.025. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.025 = 2.575\sqrt{\frac{0.0667*0.9333}{n}}

0.02\sqrt{n} = 2.575\sqrt{0.0667*0.9333}

\sqrt{n} = \frac{2.575\sqrt{0.0667*0.9333}}{0.02}

(\sqrt{n})^2 = (\frac{2.575\sqrt{0.0667*0.9333}}{0.02})^2

n = 1031.9

Rounding up

A sample of 1032 is needed.

6 0
2 years ago
In a market a $50 dress is marked. It says "Save 25%." What is the discount? What is the sale price of the dress?
ehidna [41]

Answer:

$ 37.5

Step-by-step explanation:

It is given :

Price of the dress in the market = $ 50

The shopkeeper a discount percentage = 25%

Therefore the discount amount is = 25 % of 250

                                                         $=\frac{25}{100}\times 50$

                                                         = 12.5

Therefore the sale price of the dress is =  50 - 12.5

                                                                  = 37.5

Therefore the sale price is $ 37.5

5 0
3 years ago
What is a solution and the slope of the line given?<br> y-3=2(x+1)
erma4kov [3.2K]

Answer: y=2x+5

Slope is 2

Step-by-step explanation: y=2(x+1)+3

y=2x+2+3

y=2x+5

5 0
3 years ago
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