Answer:
See explanation
Step-by-step explanation:
Let
be the coordinates of the point which has to be dilated with the scale factor of
with the center of dilation at point
(the origin).
The dilation with the scale factor
and the center of dilation at the origin has the rule

So, you have simply to multiply each coordinate of the point by
to get the image's coordinates.
Let the missing number be x
Mean is the total sum of data over the number of data therefore,
(11+20+x+3+1) / 5 = 9
Then simplify
(35 + x) / 5 = 9
Then multiply 5 to both sides
35 + x = 45
Then subtract 35 to both sides to find x
X= 10
Hope this helps!
3.70 and 3.700 are some examples to get you started.