Solve for x:

If A(4, 3), B( - 1, y) and C(3, 4) are vertices of a right triangle ABC, right - angled at A, then find the value of y.

All the vertices of a rhombus lie on a circle. Find the area of the rhombus, if the area of the circle is 1256 cm². (use π = 3.14)

The 16^th term of an AP is five times its third term. If its 10^th term is 41, then find the sum of its first fifteen terms.

A bus travels at a certain average speed for a distance of 75 km and then travels a distance of 90 km at an average speed of 10km/h more than the first speed. If it takes 3 hours to complete the total journey, find its first speed.