Apair of shoes costs $45.95. there is 9.5% sales tax on it. how do you estimate the total bill to check for reasonableness? take of $50 and add the result to $50. multiply 45.95 by 9. add 50 and 10. divide 45.95 by 100, and multiply the result by 9.5.

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