Um número menos 12 e igual a 3/4 do mesmo número. qual e esse número?

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x