Answer:
Either 8 or one
Step-by-step explanation:
Not really enough info but if u want me to explain my answer I can
Answer:
9x
Step-by-step explanation:
Since they are simmilar we will then have the following relationships.

Now, we solve for x, as follows:

The expression goes along the lines of. 15 is to 10 what 9 is to x, with this as was done we solve for x and determine it's value, that since they keep proportionality.