An exponential function in the form f(x) = abˣ k is given. the linear function f of x decreases through the ordered pairs negative 2,6 and negative 1,4 and 0,3 and 1,2.5 and 2,2.25 and 3,2.2125. what is the value of the vertical shift k? one half negative one half 2 ½
a) one half
b) negative one half
c) 2
d) ½