The third one is right i think
Draw DH perpendicular to AE.
By the Side-Angle-Side postulate ΔABE = ΔBEF.
this is the enitre answer: https://web2.0calc.com/questions/in-square-abcd-e-is-the-midpoint-of-line-bc-and-f-is-the-midpoint-o...

<u>Step-by-step explanation:</u>
Here we have , If the first step in the solution of the equation 2x - 8 = 5x + 3 is "subtract 2x," then in the form of a paragraph, explain in complete sentences the next steps necessary to completely solve the equation for x. Let's solve this :
2x - 8 = 5x + 3
⇒ 
⇒
{ subtract 2x from both side }
⇒ 
⇒ 
⇒
{ subtract 3 from both sides }
⇒ 
⇒
⇒
{ divide 3 from both sides }
⇒ 
Answer: true
Step-by-step explanation:
Hope this helps
A) you cannot combined square roots if the radicands aren't the same.
Its like variables. You can only add like terms. IE You cannot add 2x +3y.
Its the only rule that applies to the problem.