Light-years

Planet X is ten light-years away from Earth. Planet Y is 8 1/2 light-years away from Earth. How much farther away is Planet X?

Correct answer:

a =  1 12 = 3/2 ly

Step-by-step explanation:

X=10 ly Y=821=8+21=28 2+1=216+1=217=8.5 ly  a=XY=10217=210 2217=220217=22017=23=23 ly=121 ly=1.5 ly



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