(a(i))[4]
Use the cosine rule to find $BC$.
(a(ii))[3]
Use the sine rule to find angle $ACB$.
(b(i))[4]
Triangle $DEF$ has area $70\text{ m}^2$. Show that $4x^2 + 11x - 300 = 0$.
(b(ii))[4]
Use the quadratic formula to solve $4x^2 + 11x - 300 = 0$. Show all your working and give your answers rounded to 2 decimal places.
(b(iii))[1]
Find the length of $DE$.