The weight of a cylindrical metal varies jointly as its length L and the square of the diameter d of its base.
a. If Wis equal to 6kg. When L = 6cm and d=3cm, find the equation of variation.
b. Find L when W is equal to 10kg and d=2cm
c. Find W when d=6cm and L=1.4cm
pLS. HELP me . thank u