Answer:
⅜
Step-by-step explanation:
30/80
= 3/8
For this case we have the following functions:

By definition of composition of functions we have:

Then substituting:

So:

Answer:

Hi , the answer is 15 miles per hour because 45 divided by 3 equals 15 , one hour equals to 15 , two hours =30 and three hours =45 , it goes by 15.
Since it is an equilateral triangle, all of the sides are the same length.
So, x=14 :)
Hope this helps!