Apack of gum would be considered a(n) necessity luxury item small ticket item unaccountable expense

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?