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Setler [38]
3 years ago
9

Need help with these 2 problems on my homework.

Mathematics
1 answer:
poizon [28]3 years ago
4 0
4. 55 + 0.65*55 =  $90.75

5. 90.75 * 0.25*90.75 = $113.44

6. 113.44 - 0.33*113.44 = $76.00
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Solve 8(3x-4)=4x-2. Help
FinnZ [79.3K]
X = 3/2

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8 0
3 years ago
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5(-6 - 12) +4.1= <br> can you help me with this question
Sophie [7]

Answer:

-85.9

Step-by-step explanation:

4 0
2 years ago
A research group needs to determine a 90% confidence interval for the mean repair cost for all car insurance small claims. From
lutik1710 [3]

Answer:

a) z = 1.645

b) The should sample at least 293 small claims.

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{1-0.9}{2} = 0.05

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 1-0.05 = 0.95, so z = 1.645, which means that the answer of question a is z = 1.645.

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.

(b) If the group wants their estimate to have a maximum error of $12, how many small claims should they sample?

They should sample at least n small claims, in which n is found when

M = 12, \sigma = 124.88. So

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

12 = 1.645*\frac{124.88}{\sqrt{n}}

12\sqrt{n} = 205.43

\sqrt{n} = \frac{205.43}{12}

\sqrt{n} = 17.12

\sqrt{n}^{2} = (17.12)^{2}

n = 293

The should sample at least 293 small claims.

8 0
2 years ago
You go to the doctor and he gives you 13 milligrams of radioactive dye which decays exponentially. After 24 minutes, 5 milligram
suter [353]
78 minutes...............................................
7 0
3 years ago
Evaluate C= 2 xr, for r=8.<br> C= 100<br> OC= 16<br> OC= 287<br> C= 16
____ [38]
C= 2 x r where r = 8
C = 2 x 8
C = 16.
Hope I helped:)
3 0
3 years ago
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