Prove that the geodesic on a circular cylinder is a helix. [Hints: Roll a piece of lined paper into a cylinder to see the helical curves. Notice that rolling up the paper does not change the geodesic property of the curves on the surface, Why not

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Which one ? is the answer and how to find this answer

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.