Curing times in days (x) and compressive strengths in mpa (y) were recorded for several concrete specimens. the means and standard deviations of the x and y values were x = 5, sx = 2, y = 1350, sy = 85. the correlation between curing time and compressive strength was computed to be r = 0.7. find the equation of the least-squares line to predict compressive strength from curing time. round the answers to two decimal places.