For the following questions answer them individually
If (-4, 5) is a vertex and $$7x - y + 8 = 0$$ is the equation of a diagonal of a square, then the equation of other diagonal of the square is
Equation of the straight line passing through the point (1, -5) and making intercepts in the ratio 2 : 3 on the axes is
If $$\sec \theta + \tan \theta = \frac{2}{3}$$ then the quadrant in which $$\theta$$ lies is
If the angles of elevation of the top of a tower of height 60 m and the top of a flag staff on the tower from a point on the level ground are $$30^\circ$$ and $$60^\circ$$ respectively, then the length of the flag staff in metres is
If the polynomial $$7x^4 + 4x^3 - 6x^2 + ax + b$$ is divisible by $$x - 1$$ and $$x + 1$$, then $$a + b =$$