Given That F(2, 4)= 1 $f _ { u } ( 2,4 )$

Essay

Given that f(2, 4)= 1.5 and f(2.1, 4.4)= 2.1, estimate the value of $f _ { u } ( 2,4 )$ , where $\vec { u }$ is the unit vector in the direction of $1 \vec { i } + 4 \vec { j }$ Give your answer to four decimal places.