The equation below is a polynomial of order 4, fitted to the data recorded in a creep test conducted on a particular type of steel, for an elapsed time between 10 to 20 hours. E = 4.3 x 10^-5t^4 0.0026t^3 + 0.055t^2 0.33t + 1.5032 The data were recorded for % strain versus elapsed time in hours. Use this equation to calculate the creep strain rate at 15 hours elapsed time. Give your answer to 1 significant figure.