Answer:

Step-by-step explanation:
To understand this question you would first of all need to know about negative exponents and multiply fraction by integers.
Example I would like to find out
,
You would first normally solve this question by squaring, which would result in 4 then divide it by 1. Like this: 
Which would be 0.25 or 1/4
Lets apply this knowledge to the following question:
1. 
2. 
3. 
Simplified is 18/25. thats the answer
Answer - 10 meters
10 meters
Explanation:
Using the ratios given, we have the three sides in terms of one side.
(x, x+5, 4x)
The perimeter is the sum of all of them:
65 = x+x+5+4x ; 65 = 6x+5
6x = 60 ; x = 10
x+5 = 15
4x = 40