Is it permissible for the wife to give the Zakah (obligatory charity) of her money to her poor husband?
                                Yes, it is permissible for the wife to give from the Zakah of her money to her poor husband. And Allah Knows Best.
                             
                        
                            
                                
                                What is the ruling on someone who perform their prayer after finishing it because they believe they missed a Rak'a, a prostration, or that they did not perform it correctly (thinking their prayer was invalid)?
                                If he was sure that his prayer is void then reperforming it is an obligation along with figuring out the reason of invalidity so long as this wasn't out of uncertainty. And Allah Knows Best. 
                             
                        
                            
                                
                                 Is Hyena's Meat Permissible or Impermissible?
                                All perfect praise be to Allah, the Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallahu ‘alayhi wa sallam, is His slave and Messenger.
There is disagreement amongst the jurists as regards the ruling on eating hyena`s meat. Shafi`i and Hanabli jurists are of the view that eating hyena`s meat is permissible. The proof is the Hadith related by Al-Baihaqhi on the authority of Ibn Abi Ammar who said: "I asked Jabir bin Abdulla about hyenas, and he told me to eat them. I said: "Is it not game? He said: 'Yes' I said: 'Did you hear that from the Messenger of Allah?" He said: "Yes."  And Allah The Almighty Knows Best.
                             
                        
                            
                                
                                What is the ruling on taking part in an online contest to win a prize of 100,000 dollars in return for answering thirty questions in different fields of knowledge and science? Knowing that there is no drawing of lots; only one or two cards are purchased to commence the contest.
                                Praise be to Allah the Lord of the Worlds. May His peace and blessings be upon our Prophet Mohammad and upon all his family and companions.
This is a form of gambling, which is impermissible to participate in, because the people in charge of this online contest increase the value of the calls to compensate for the value of the prizes. And Allah The Almighty Knows Best.