Make up a statistical question and then find the data and answer it. (The data can be made up)

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

The sum of two numbers is 86, and their difference is 20. find the two numbers

What other information do you need to prove triangle dac=bca by asa