That the last one
A parallelogram is not always a rectangle
We can create a formula first.
X will be the unknown number
840= 357+x
-357 -357
483 = x
Hope this helps
Answer:

Step-by-step explanation:
Given

Required
Calculate one of the root of the equation

Factorize


Split equation

Make x the subject of formula in both expressions


<em>From the list of given options, one of the roots of the equation is</em> 
Answer:
No. They are not proportionate.
Step-by-step explanation: