The question is implying a function of 1.75x+9.5=y x=seconds y= ounces of juice.
So you plug in 6 for x so that you can find the amount of juice.
1.75(6) +9.5=y
10.5 +9.5=y
20=y
So therefore the answer is C due to at 6 seconds there will be 20 ounces.