Use linear approximation, i.e. the tangent line, to approximate v 64.3 as follows: Let f(ac) = Va. The equation of the tangent line in slope-intercept form to f(x ) at x = 64 can be written in the form y = ma + b where: m b Using this, we find our approximation for v 64.3 is NOTE: For this last part, give your answer to at least 6 significant figures or use fractions to give the exact