Triangle C D E is rotated 90 degrees to form triangle C prime D prime E prime.
2 answers:
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So given the values on the number line, AB and BC, adding them together will get the length of AC. If AB equals 
and BC equals 
, the value of AC should be 
. Since you are given the length of AC, 
, you can create an equation to solve for x. This equation would be 
. Isolating the x on the left (or right hand side) gets the value of x to be 19. The same thing goes for the 2nd question.