Includes basic factorising of x squared coefficent = 1, x squared coefficient > 1 and using the quadratic formula. (tes.com)
Correlation The correlation coefficent measures the stregnth and direction of a linear relationship between two variables. (us.spdrs.com)
Engines are minutely less efficient than the saloon, due to the slight kerbweight increase and the drag coefficent dropping from 0.22 to 0.26 Cd. (autoexpress.co.uk)