Point a is the midpoint of xy. Point y is the midpoint of xz. Point z is the midpoint of ab. If xa is 2cm long how long is xb

Question

Need help on this question nust make a picture and the answer 

Answer 1

You have neglected to say that ALL points mentioned are collinear.

 

Draw the picture; points (all of whose names ought to be single capital letters) occur in this order, from left to right:

 

X  A  Y    Z      B     and the lengths are 

  2  2   4    6, I believe.

 

Check it out, carefully.

Answer 2

from the information given...

xa=ay, xy=yz, az=zb

ay=2 so xy=4

therefore yz=4

zb=6 because zb=az and az=ay+yz

xb=xa+ay+yz+zb

xb=2+2+4+6

xb=14 cm