1.\:\:\lim _{x\to 4}(\frac{\sqrt{x}-2}{x-4})
                                
                             
                                                    
                                
                                    2.\:\:\lim _{x\to 13}(\frac{\sqrt{x-4}-3}{x-13})
                                
                             
                                                    
                                
                                    3.\:\:\lim _{x\to 0}(\frac{\sqrt{1+x}-1}{x})
                                
                             
                                                    
                                
                                    4.\:\:\lim _{x\to 9}(\frac{\sqrt{x}-3}{x-9})
                                
                             
                                                    
                                
                                    5.\:\:\lim _{x\to 4}(\frac{2-\sqrt{x}}{4-x})
                                
                             
                                                    
                                
                                    6.\:\:\lim _{x\to \infty}(\sqrt{x^2+4}-x)
                                
                             
                                                    
                                
                                    7.\:\:\lim _{t\to \infty}(\frac{\sqrt{t}+t^2}{6t-t^2})
                                
                             
                                                    
                                
                                    8.\:\:\lim _{x\to \infty}(\frac{\sqrt{x}+x^2}{4x-x^2})
                                
                             
                                                    
                                
                                    9.\:\:\lim _{x\to \infty}(\frac{\sqrt{x}}{x-5})
                                
                             
                                                    
                                
                                    10.\:\:\lim _{x\to \infty}(\frac{\sqrt{x}+x^2}{3x-x^2})