The solutions that
@tywebb has provided a link to contain at least two mistakes...
Q14 should be
y = 6
x + 1 rather than
y = 54
x + 1 (the solution uses
m = 54 at
x = 1 as the gradient of the tangent, but the point of interest was (0, 1) and so they should have found that
m = 6 at
x = 0).
Q20 should have three solutions rather than two, the solution at theta = 360 degrees has been missed.
Also, the scale used in drawing the sketch in Q30 is awful, the height of the maximum above the
x-axis should be about 30 times the size of the height of the minimum below the
x-axis.