You first have to find the length of each side.

AB=4

BC=4

CD=4

AD=4

Since this is a quadrilateral, two sides will have the same length, in this case, they all do so you can pick any two sides.

4(4)=16.

1) You divide all the numbers that need to be divided

2) Move constant to the right

3) Add your numbers

And it will get you your answer = y=10.9

Here’s another answer if you didn’t understand the other one

Divide your numbers- y-4/10=21/2

Move constant to the right- y-0.4=10.5

Add the numbers- y=10.5+0.4

Hopefully that helped :)

**Answer:**

They are dependent events. Event A is choosing one musician while Event B is choosing another musician. THey are ALL musicians, no matter what instrument they play, we just know that there are 7 musicians in total. Therefore, the events are dependent because after choosing one musician, you would have 6 musicians left, instead of 7.

**Step-by-step explanation:**

**Step-by-step explanation:**

the calculation is included. I hope its self explanatory