Solve the equation 2a\(^2\) - 3a - 27 = 0

calculate the surface area of a sphere of radius 7cm [Take π = 22/7]

If the radius of the parallel of latitude 30°N is equal to the radius of the parallel of latitude θ°S, what is the value of θ?

A cylindrical container closed at both ends, has a radius of 7cm and height 5cm [Take π = 22/7]
Find the total surface area of the container