Hi last one sorry i dunno how to solve these at all

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question

Consider the function below. which of the following functions could be the inverse of function f? pic below

Determine whether angle-angle-angle (aaa) is a valid means for establishing triangle congruence. if it is a valid criterion, explain why. if it is not valid, use geogebra to create a counterexample demonstrating that it doesn’t work and give an explanation. if you construct a counterexample, take a screenshot of your work, save it, and insert the image in the space below.