I believe it is 17.0, I hope this helps some
it's A because you put your Decimals in order and round the nearest tenths.
Given:
4:x::x:16
To find:
The value of x.
Solution:
We have,
4:x::x:16
It means, we have
4:x = x:16
It can be rewritten as

On cross multiplication, we get


Taking square root on both sides.


Since ratio can be negative or positive, therefore, the value of x is either -8 or 8.
70 is a composite number because it can be divided by numbers other than one and itself.