3 years ago

R' (-1, 9) is the image of R after a reflection in the x-axis. What are the coordinates of R?

1 answer:

Yanka [14]3 years ago

8 0

(1,9) HERE COMES THE SUN DUDUDU HERE COMES THE SUN

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VARVARA [1.3K]

3(x+4)^2-24=0

3(x+4)^2 = 24

(x+4)^2 = 24/3

(x+4)^2 = 8

(x+4)² = (2√2)² ⇒ x+4 = 2√2 ⇒ x = 2√2 - 4

6 0

3 years ago

Marina86 [1]

I'm not sure if this is the easiest way of doing this, but it surely work.

Let the base of the triangle be AB, and let CH be the height. Just for reference, we have

$AH=2,\quad HB=6,\quad AC=x$

Moreover, let CH=y and BC=z

Now, AHC, CHB and ABC are all right triangles. If we write the pythagorean theorem for each of them, we have the following system

$\begin{cases}4+y^2=x^2\\36+y^2=z^2\\x^2+z^2=64\end{cases}$

If we solve the first two equations for y squared, we have

$y^2=x^2-4\\y^2=z^2-36$

And we can deduce

$z^2 = x^2+32$

So that the third equation becomes

$x^2+x^2+32=64 \iff 2x^2 = 32 \iff x^2=16 \iff x=4$

(we can't accept the negative root because negative lengths make no sense)

7 0

3 years ago

bearhunter [10]

The answer is b

i think , im not sure

6 0

3 years ago

Angelina_Jolie [31]

Answer:

the second cda is right give brainliest pls

Step-by-step explanation:

7 0

3 years ago

fenix001 [56]

The answer is 0 because it isn't above 49 and therefore can't be rounded to 100.

Hope this helps :)

3 0

3 years ago