US STOCKS-Wall St opens up, Nasdaq set to extend record
* Amazon shares touch life high after revenue beats estimates
* Comcast drops plan to merge Time Warner Cable
* Xerox slumps as it cuts forecast
* Dow flat, S&P up 0.1 pct, Nasdaq up 0.6 pct (Updates to open)
By Tanya Agrawal
April 24 (Reuters) - Wall Street opened up on Friday as strong results from tech behemoths Google, Amazon and Microsoft set the Nasdaq Composite on track to extend its record close set the previous session.
Amazon shares soared as much as 15.6 percent to a lifetime high of $451 after the e-commerce company's revenue came in above estimates on Thursday.
Google gained 2.8 percent to $573.15 after reporting higher quarterly revenue and profit and Microsoft added 6.6 percent to $46.22 after it topped Wall Street estimates.
The Nasdaq Composite closed at 5,056.06 on Thursday, surpassing its record set in March 2000, just before the dot-com bubble burst. Continuación...