Yes because 84+45 is 129 and 3(28+15) is 129
Answer:

Step-by-step explanation:
Using the given measurements of the angles and the lengths of the sides, we can determine that this figure must be a <u>rectangle</u>.
Diagonals of a rectangle are <em>always</em> equivalent/congruent.
We can use this information to set up an equation:

Add 3 to both sides:

Subtract 5x from both sides:

Divide both sides by 2

Answer:

Step-by-step explanation:
Area of a square = 
If l =
,
Then area = 
HOPE THIS HELPS
Answer:
x-1=0 x=1
x+1=0 x= -1
x+5=0 x= -5
Step-by-step explanation: