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We should recall that two lines are parallel when they have the same gradient. We can see the gradient of a line by writing it in the form y=mx+c, which will make the gradient equal to the coefficient of ...

Rearranging the second equation gives x=2y+1. Substituting this into equation 1 gives (2y+1)²+y²=13.Rearrangingthis and factorising the quadratic equation gives (5y-6)(y+2)=0, giving...

3/2x² -2/5x^5/2 +C

sin(x)2 + cos(x)2 = 1 divide by cos(x)2 tan(x)2 + 1 = sec(x)2 therefore tan(x)2 = sec(x)2 - 1 integral of sec(x)2 - 1 rwt x = tan(x) - x + C therefore the integral of tan(x)2 rwt x = tan(x) - x + C

At the end of each group. Say you have a table of groups and frequencies corresponding to those groups, for example for x we have group 0<x<=5 with frequency 6 and group 5<x<=15 with frequency...