What is the prime factorization of 81? Enter your answer as a product of prime numbers, like 2 x 3, or as a single prime number, like 17.

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Write the expression 7x^3-28xy^2 as the product of 3 factors

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters