48/8 can equal 6. I hope this helps!
The correct answer to this problem would be -3. Based on the points you've provided on the graph, -3 would be the correct common difference. :)
Answer: 3. HAVE AN AMAZING DAY
Given CD is an altitude such that AD=BC , AB=3 cm and CD= √2 cm.
Let AD=x, Since given AB=3
AD+DB=3
x+DB = 3
DB = 3-x
Since ΔBCD is rght angle triangle, let's apply Pythagoras theorem



Since given AD=BC,let us plugin BC=x in above step.


6x=11
x=
Now we know AD=x=
and given CD=√2.
Let us apply Pythagoras theorem for ΔACD



= 2.315cm