If q represents the quantity of solution needed, you require
... 0.90q = 0.15×(100 mL)
... q = (0.15/0.90)×(100 mL)
... q ≈ 16.7 mL
_____
You actually need 16 2/3 mL of concentrated solution.
3 ( C ) should be the correct answer choice !!
Look at the coordinates. They are both negative. (-5,-1)
Let me plot all the coordinates so you can see:
Joe= (-3,4)
Dan= (1,4)
Roy= (2,-3)
Lee= (-3,-4)
The only person with coordinates that are both negative is Lee.
"C" is the answer. Lee.
I hope this helps!
~kaikers
