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Bogdan [553]
3 years ago
14

Which transformation shows a reflection across the y-axis? A) A B) B C) C D) D

Mathematics
2 answers:
Masteriza [31]3 years ago
7 0

Answer:

The answer is A

Step-by-step explanation:

vichka [17]3 years ago
4 0
<h3>Answer: Choice A (upper left corner)</h3>

This shows a mirroring effect over the vertical y axis.

Choices B and C are a translation (aka shifting)

Choice D is a reflection but over the horizontal x axis.

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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
3 years ago
Evaluate 3-5 using a number line.​
Alekssandra [29.7K]

Step-by-step explanation:

= 3 - 5

= -2

line in the picture

4 0
3 years ago
Can 3 and 3/5 also be rewritten as 3 and 15/20?
mario62 [17]
No,because your supposed to multiply it by the same number.
7 0
3 years ago
Read 2 more answers
A recipe calls for 2 cups of flour to make 24 cookies. write and solve a proportion to find how much flour is needed to make 54
bekas [8.4K]
2 cups of flour          x cups of flour
––––––––––––   =   –––––––––––––
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cross multiply
2*54=24x
24x=108
x=4.5

4.5 cups of flour

8 0
3 years ago
The sum of two numbers is 24 and their difference is 2?
mote1985 [20]
X + y = 24
x - y = 2

Adding both equations
2x = 26
x = 13
y = 11

7 0
3 years ago
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