Answer :
Answer:
The length of the segment AB is 18.8 cm or 1.88 dm
Step-by-step explanation:
The question in English is
Points A, B and C are collinear in this order. Find the length of the segment: a) AB, if AC = 20 cm, BC = 0.12 dm
we have that
[tex]AC=AB+BC[/tex] ----> by Addition segment postulate
substitute the given values in centimeters
Remember that
[tex]1\ dm=10\ cm[/tex]
so
[tex]0.12\ dm=0.12(10)=1.2\ cm[/tex]
[tex]20=AB+1.2[/tex]
solve for AB
[tex]AB=20-1.2\\AB=18.8\ cm[/tex]
Convert to dm
[tex]18.8\ cm=18.8/10=1.88\ dm[/tex]
therefore
The length of the segment AB is 18.8 cm or 1.88 dm