The rhombus has 4 equal sides so to find the length of a side you just divide the perimeter by 4.
-13+7k-4=23+16k-2
-13-4=23+9k-2
15=23+9k
-8=9k
-8/9=k
Answer: 
Step-by-step explanation:
The first thing you must remember is the mulplication of signs. You know that:

You can observe that the number inside the parentheses is positive (+) and the sign that is outside the parentheses is negative (-), therefore, when you multiply these signs you get a negative sign (-). Then you get:

Now, you need to add these numbers. And the result obtained is:

Answer:
2.6 meters.
Step-by-step explanation:
5-0.9 is 4.1, minus 1.5 is 2.1.