An investigator plots 1/v as a function of 1/(concentration of substrate) for data collected with and without an inhibitor. The best-fit line of the data collected in the absence of the inhibitor had a slope of 0.22 (arbitrary units of time) and a y-intercept of 0.04 (arbitrary units of time per concentration). The best-fit line of the data collected in the presence of the inhibitor had a slope that was 2.9-times as steep (arbitrary units of time) and a y-intercept of 0.04 (arbitrary units of time per concentration). If the concentration of inhibitor was 79 nM, what is the value of the inhibition constant K_i in terms of nM to the nearest tenth?