If f(a)=4a-5 what is f(3)-f(1.25)

f(a)=4a-5

1:    a=  -5  / f−4

f(3)-f(1.25)

2:   1.75f

Step-by-step explanation:

fa=4a-5

f(3)-f*1.25

Step-by-step explanation:

You might think that the volume of a circle is needed to solve this problem but you can do it in a more simplified manner. First figure out how much water 85 marbles displace.

26-20.9=5.1 liters of water

Now, let us see how much water 200 marbles displace.

85 marble x (200/85) = 5.1 liters x (200/85)

200 marbles = 12 liters

We can find the amount of water needed to fill the tank now.

26-12=14 liters of water

14 liters of water