Answer:
c
Step-by-step explanation:
with some experience you see this immediately.
here some detailed thoughts :
the curve is always positive, even for small n incl. n = 0.
so, all answer options with "-75" are out, because clearly for n = 0, t = +75 and not -75.
and because the graph shows the function is increasing with increasing n, the answer options with "-15n" are out, as that would mean the functional value would decrease with increasing n.
so, only c is left.
