Question

PLEASE HELP, THIS IS MY LIFE, I WILL GIVE U A MEDAL

Answer 1

A line segment with endpoints Q three comma negative two and R negative four comma six is dilated with the origin as the center of dilation. The resulting endpoints are Q prime twenty-seven comma negative eighteen and R prime negative thirty-six comma fifty-four. What is the scale factor?

one-ninth

one-third

3

9

Answer 2

plz help

Answer 3

Q(3,-2), R(-4,6)
Q'(27,-18), R'(-36,54)

right?

Answer 4

Yes

Answer 5

Given that the dilation happened with the origin as the center, you can find the scale factor by just taking the ratio of the ' coordinates to the non-' coordinates.

Answer 6

So it is either A OR B?

Answer 7

Looking at Q and Q', for example:

\[\frac{27}{3} = \]\[\frac{-18}{-2}=\]

You check your answer by multiplying it with the original coordinates. If you get the transformed coordinates, the answer is correct. If you don't, it isn't.

Answer 8

So: it is not A OR B?

Answer 9

You tell me.

Answer 10

http://openstudy.com/study#/updates/531101ffe4b0cecd2345cd9b

Answer 11

A is 1/9. Does 1/9 * the x coordinate of Q give you the x coordinate of Q'? If it does not, then it is not the correct answer.

B is 1/3. Does 1/3 * the x coordinate of Q give you the x coordinate of Q'? If it does not, then it is not the correct answer.

Answer 12

I got A

Answer 13

@aa123 please DO NOT DO THAT! If you want to get someone's attention, tag them by putting @ followed by their username in a post

Answer 14

A is 1/9. I ask again, does 1/9 * the x coordinate of Q (which is 3) give you the x coordinate of Q' (which is 27)?

Answer 15

Thank you @whpalmer4 i dont like getting the answer right away ;)

Answer 16

No

Answer 17

Okay, then it's a bad choice if you want to get the problem correct :-)

Answer 18

LOL, it would not be B too right?

Answer 19

It would also not be B.

Answer 20

Becasue b is wrong right?

Answer 21

Ok good

Answer 22

I got 3

Answer 23

Sigh. Look, the new coordinate is the old coordinate * the dilation factor.

\[27 = 3 * df\]\[df =\]

Answer 24

I got 3

Answer 25

Or we could try the y coordinate of Q:
\[-18 = -2*df\]

Or the x coordinate of R
\[-36 = -4 * df\]

etc. All of them will give the same answer.

the dilation factor is?

Answer 26

i got 9

Answer 27

That's good, as I believe it is the only answer left. Also, it's the correct one :-)

Answer 28

Ok thank u so much u did help

Answer 29

you're welcome!

Answer 30

can u help me with one more

Answer 31

Bring it on :-)

Answer 32

LOL ok thank u

Answer 33

it is acuttally 2

Answer 34

there

Answer 35

Okay, I guess the first problem is you need to know how to spell "actually", right?

What's the second problem? :-)

Answer 36

LOL sorry i was not looking

Answer 37

So, question 18?

Answer 38

i say a

Answer 39

i say a for 18

Answer 40

and for 19 i say D

Answer 41

That's correct. A rhombus has 4 equal sides, but they may be part of 2 different pairs of angles. A square is a rhombus with 4 right angles. All squares are rhombuses, but not all rhombuses are squares.

If by rotational symmetry, you mean that you can turn the figure to the right or the left and get the same thing, then I don't believe it has any rotational symmetry.

Answer 42

Ok thank you so 19 is a?

Answer 43

Well, it'd be best to check with your course materials to see how they talk about rotational symmetry, but assuming the figure stays flat on the page, you can't rotate it and get something that looks identical, can you?

Answer 44

Right ok ;)

Answer 45

Can I open another question so that u can help me, and so that I can give u a medal ;)

Answer 46

You know, an equilateral triangle can be turned 120 degrees, and it looks identical, right? It can also be turned 240 degrees and look identical. That clearly is rotational symmetry. A square can be rotated a multiple of 90 degrees and look identical. But this thing, I think the reasonable choice is no rational symmetry.

Answer 47

Sure, post another question and tag me.

Answer 48

Ok thank u so much u explain it good