HELP!! please can anyone answer this one?!? What is the answer? Explain? Please

Mathematics

2 answers:

Juliette [100K]4 years ago

7 0

"A congruent image with the same coordinates as vertices."

That's an awkward way to put it. What this is really asking is:

Which transformation is a symmetry?

where by symmetry we mean an operation which maps the parallelogram to itself.

For the parallelogram shown the reflections aren't symmetries because the vertices don't map to each other. Neither is the 90 degree rotation.

But the 180 degree rotation accurately captures the symmetry of the parallelogram. Of course for 180 degrees it doesn't matter it it's clockwise or counterclockwise.

Answer: Choice D

Annette [7]4 years ago

4 0

I believe it would be C, because it's not D, 180 because 180 would be a reflection and B makes no scense it wouldn't be A, because it's not a 180 degree turn.

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. The mean width of 12 iPads is 5.1 inches. The mean width of 8 Kindles is 4.8 inches. a. What is the total width of the iPads?

UkoKoshka [18]

Answer:

a) 61.2, b) 38.4 and c) 4.98

Step-by-step explanation:

Given:

The mean width of 12 I-Pads is 5.1 inches.

The mean width of 8 Kindles is 4.8 inches.

Question asked:

a. What is the total width of the I-Pads?

b. What is the total width of the Kindles?

c. What is the mean width of the 12 I-Pads and 8 Kindles?

Solution:

<u /> $Mean =\frac{Sum\ of\ observations}{Number\ of\ observations}\\ \\ Mean\ width =\frac{Sum\ of\ width\ of\ all \ I-pad}{Number \ of\ I-pad}$

$5.1=\frac{Sum\ of\ width\ of\ all\ I-pad}{12} \\ \\ By \ cross\ multiplication\\ \\ Sum\ of\ width\ of\ all\ I-pad}=5.1\times1 2\\ \\ Sum\ of\ width\ of\ all\ I-pad}= 61.2$

a) Thus, the total width of the I-Pads are 61.2 inches.

$Mean\ width =\frac{Sum\ of\ width\ of\ all\ Kindles}{Number \ of\ Kindles}$

$4.8=\frac{Sum\ of\ width\ of\ all\Kindles}{8} \\ \\ By \ cross\ multiplication\\ \\ Sum\ of\ width\ of\ all \ Kindles=4.8\times8\\ \\ Sum\ of\ width\ of \ all\ Kindles}=38.4$