Please Help

- adajiamcneal

Please Help

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- adajiamcneal

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- adajiamcneal

i think its a but im not sure..

- anonymous

@adajiamcneal Your answer is well :)

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## More answers

- theopenstudyowl

I think it's 10 but I am a bit unsure...

- adajiamcneal

ok thank you :) i have a couple more ..

- anonymous

K let me know :)

- adajiamcneal

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- adajiamcneal

@Omar_Elboredy

- anonymous

So let's take it easily and step-by-step , you have 2 polygons of the same shape and U want to compare them ... Then the easy step is to use ratio!
\[\frac{ 12 }{ 40 } = \frac{ 3 }{ x }\]
Then nw you have to get x in one side and othe stuff on the other side like that
\[\frac{ x }{ 3 } = \frac{ 40 }{ 12 } \]
Multiplying both sides by 3 : \[x = \frac{ 40 }{ 4 } = ?\]
Let me know if you got it :)

- adajiamcneal

B ?

- anonymous

aha (y)

- adajiamcneal

because 40/4 = 10 lol

- anonymous

:)

- adajiamcneal

c?

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- adajiamcneal

@Omar_Elboredy

- anonymous

1 cm = 10 ft.
then 4.7 cm = ?
By criss-cross : ? = 4.7 * 10 = 47 ft :)
Which will be "D" :)

- adajiamcneal

b? @Omar_Elboredy

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- anonymous

To find length of hypotenuse use Pythagorean theorem .
Applying this to given prob. you will get : \[\sqrt{17^2 + 17^2} = 17\sqrt{2}\]
Which will be C

- adajiamcneal

@Omar_Elboredy idk how to do this one.. i typed it in the calculator and i dont get any of the options.

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- anonymous

Could U plz show me wat U typed ! :D

- adajiamcneal

lol i have a scientific calculator i typed in 7 and hit tan-1 haha

- anonymous

So wat U got out ?

- adajiamcneal

0.122784561 lol

- anonymous

O.o
See. .. First be sure that you are in the deg. mode and then type in sth like this : \[\tan^{-1} 7\]
and then hit equal sign then let me know wat U get :)

- adajiamcneal

it is in the degree mode and i still get the same thing

- anonymous

U hit tan(7) ! :D

- anonymous

U have to hit this : shift button then tan button u will get tan-1 shown on the screen :D
then type 7 and show me wat U get

- adajiamcneal

ohhhhhhh its c lol i feel dumb -.-

- anonymous

:D

- adajiamcneal

ok if i need more ill tagg you in a different question :) thank you

- anonymous

If U wanna pm me it's ok :)

- adajiamcneal

@ayyookyndall

- anonymous

K let me see wat's next :D

- adajiamcneal

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- anonymous

mmmmm I couldn't figure out what's wrong with that question .. I think it's 40 cm^2 but the answer is not shown ! :D

- anonymous

Aha I got the trick :D
You have to calculate the missing portion of the base which will be 8 &
\[\frac{ 4 }{ \sin(45) } = 4\sqrt{2}\]
Then apply the rule you will get sth near "C" :)

- adajiamcneal

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- anonymous

For reflection about the y-axis you have think about it like you a mirror on the y-axis which means that the y-coordinates for each point will be the same the only change will be with the sign of x-coordinates for each point
So wat will be the answer ? :)

- adajiamcneal

D?

- anonymous

By this you changed the sign of both x-coordinates and y-coordinates ... And we only want to change the sign of x's

- ayyookyndall

Its C, correct?

- anonymous

Yes :)

- anonymous

Take this as a rule :
If you wanna reflect about x-axis just change the sign of y-coordinates only
If you wanna reflect about y-axis just change the sign of x-coordinates only
If you wanna reflect about the origin just think you do this in two steps .. one about x-axis and the other is about the y-axis :)

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- adajiamcneal

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- anonymous

This includes two separate types of data : Angle and length(magnitude)
The angle is calculated like this :
you know from trig rules that SOH CAH TOA >> \[\sin(x) = \frac{ Opposite }{ Hypotenuse } , \cos(x) = \frac{ Adjacent }{ Hypotenuse } , \tan(x) = \frac{ Opposite }{ Adjacent }\]
Then you nw have wat for x ?
Opposite which is -12 and Adjacent which is - 26 , then use which rule ?
We use tan , the this will be sth like this : \[\tan(x) = \frac{ -12 }{ -26 }\]
and to get x we have to do tan-1 ! :D then x will bet : \[x = \tan^{-1} (\frac{ -12 }{ -26 } = 24.775\]
which is nearly 25 deg
the nw for the direction : its west south (y)
Now wat ? :D
It's magnitude

- anonymous

So let's calculate magnitude , as you know this is a right-angled triangle , so to get the length of hypotenuse we use the Pythagorean theory which is :
\[a^2 = b^2 + c^2\]
we here have b and c |dw:1432965278834:dw|
so to get a we apply the rule and we simply get \[a^2 = 820\]
to get a we take the square root for both sides in which we will get \[a = 29\]
so the answer will be ?
Let me know wat you figured out :D

- adajiamcneal

D

- anonymous

What is the value of angle (x) ?

- adajiamcneal

24.775

- anonymous

which is 25 ok :D
Then by this we exclude D and B , now what is the direction ?

- adajiamcneal

west south

- adajiamcneal

oh so its a?

- anonymous

Exactly ! :D

- adajiamcneal

ok im done :) kyndall might need help though so can you please help her ?

- anonymous

K no prob. feel free to ask me anytime :)

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