=R=Y2 OVER 8X + X OVER 2 WHAT IS THIS WHEN Y=11.9 AND X = 0.21
the equation is
R =( Y/ 8X) + ( X / 2)
substitute the given values for Y and X into the equation
R = {11.9 / (8*0.21)} + ( 0.21 / 2)
R = (11.9 / 1.68) + (0.21 / 2)
R = 7.083 + 0.105
R = 7.188