No they are not similar.
8/16 <> 12/12 or 8/12 <> 12/16
500,000 is that number rounded.
The scale factor of the given dilation is 3.
Step-by-step explanation:
Step 1:
In order to determine the scale factor, we divide the measurement after scaling by the same measurement before scaling.
In the given graph, the preimage has a length of 3 units while the image has a length of 9 units.
Step 2:
So here the measurement after scaling is the length of the image which is 9 units and the measurement before scaling is the preimages length of 3 units.
The scale factor 
So the scale factor is the third option 3.
Answer
given radicals
convert them into simplest radical form
a) √49
√49 = \sqrt{7\times 7}
= 7
b) ∛40
∛40 = ![\sqrt[3]{2\times 2\times 2\times 5}](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7B2%5Ctimes%202%5Ctimes%202%5Ctimes%205%7D)
= 2 ∛5
c) √242
√49 = \sqrt{2\times 11\times 11}
= 11 √2
hence the number are converted into simplest radicals or rational form.