Use cymath it gives you the math answers but the answer is x=74
Answer:
It's 16 units. Just look at the lengths and how many times they are on a shape. The shape is a rectangle, which means there will be two of each length, so just add them all together. 6+6+2+2=16
Answer: 
-3 times the square root of 5
=============================================
Explanation:
Let 
Replace all the root 5 terms with x and we go from

to

From here, combine like terms to get

and the last thing to do is replace the x with sqrt(5)

Meaning that,


The answer would be 7.5, since 6/9=2/3 and 5/7.5=2/3, then the sides are equal ratios.
Your answer is c
.............................
Hope this helped you :)