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A hot air balloon flying at 950m/h at a constant altitude of 3000m is observed to have an angle of elevation of 78 degrees. After 20 minutes, the angle of elevation is 73 degrees. Calculate the angle through which the observer has turned during those 20 minutes. Working Out...

if sinx = 2/3 and cosy = 3/4, find the exact value of a) sin(x+y) Thanks for the help :)

I'm unsure if the working out is correct.

Show that: (n+2)! + (n+1)! + n!= n!(n+2)^2

One of the roots of the cubic x^3+ax^2+36x-36=0 is the product of the other two roots. Find the value of a and hence find all the roots.

Write down an odd monic polynomial of least degree with a triple root of x=-2 and a root of x=1

Solve 6x4+5x3-24x2-15x+18=0 if the sum of two of its roots is zero.