The next model of a sports car will cost 5.1% less than the current model. the current model costs $42,000 . how much will the price decrease in dollars? what will be the price of the next model?

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30