Weiß jemand wie ich hier weiterkomme?

a) you can just read. Water level(in cm) and feed time(in min)

(b) The Y-axis section is simply the water level before water has been poured.

(c) The gradient is thus constantly poured into water all the time. So there is no time interval to add more water than in another

(d) This is a linear function. These have the shape mx+b (b=Y-axis section; m= gradient)

b is 15 as already in function b).

So mx+b

m is the slope, you can simply count boxes:

Then the one in x direction through the parts in y direction and you come to 5/2.

Pay attention to the different scaling of the axes.

So (5/2)x+15

If you have any questions, please ask.