Question

Which equation best represents the relationship

between n and I?

a. t= -15n + 75
b. t= -15n-75
c. t = 15n + 75
d. t= 15n-75

Answer 1

c

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.