write a program to ask the user to enter a value for x,

write a program to ask the user to enter a value for x, compute and display y's value:
a program to convert pounds to Kilograms. ( Recall that 1 KG=2.205 lb.)
a program to compute the area A of a triangle with base b and height h ( Recall A=(1/2)(b*h) )
a program to compute the volume V of a sphere of radius r. ( Recall V=(4/3)(pi *r^(3))