Calculate the Value of x

In Figure,O is the centre of the circle and /_DAB=50^(@) .Calculate the values of x and y

In given fig., if (x)/(3)=(y)/(4)=(z)/(5) , then calculate the values of x,y and z.

If P(5,7), Q(x,-2) and R(-3,y) are collinear points such that PR = 2PQ, calculate the values of x and y.

Calculate the value of lim_(x rarr0)(x cos x-sin x)/(x^(2)sin x)

Calculate the value of a, if x = a and y = b is the solution of the linear equations x - y = 2 and x + y = 4.

Calculate the value of 'K', if x = k is a solution of the quadratic polynomial x^2 + 4x + 3 .

Calculate the value of k, if x=k is a solution of the quadratic polynomial x^(2)+ 4x+ 3 .

For [CrCl_(3).xNH_(3)] , elevation in b.pt of one molal solution is triple of one molal aqueous solution of urea. Assuming 100% ionisation of complex molecule, calculated the value of x .