Answer:

Step-by-step explanation:
Perimeter is just adding all of the sides' lengths together, so we can put all of them into one big equation and then combine like terms.

Hope this helps!
Answer:
8/21 = -2/7x
8*7x/21 = -2
56x/21 = -2
56x = -2*21
56x = -42
56x/56 = -42/56
<h2>X = -3/4 , -0.75</h2>
Step-by-step explanation:
5 and 6 is the square root of 28
Answer:
For question 13, it would be a) the angles are vertical.