1) If CB= 13; BF= 9; EF=7; Then DE=?
Round to the Hundredths. 
(Hint: (whole secant)(external part) = (whole secant)(external part)
FIND DE=?
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HURRY I NEED IT FAST!!
WILL MARK BRAINLIEST!!
                                             
                                          
                                          
                                        
											 
			                  