What is variation?

What is the variation in acceleration due to gravity with altitude? OR Derive an expression for the gravitational acceleration at an altitude h above the earth. OR Show that the gravitional acceleration at a height h above the surface of the earth is (in usual notations) g_h = g (frac(R)(R + h)^2)

What is Genetic variations? Explain the different factors responsible for genetic variations.

y varies directly as the square root of x. When x = 16, y = 24. Find the constant of variation and the equation of variation.

Find the constant of variation and the equation of variation in the following. y varies inversely as x. If x = 3, y = 8