During an alpine skiing event, the

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

c is the answer

step-by-step explanation: