I need help on number 5 and 6 it can be answer only or with explanation plz helpp

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.

Need asap i will give brainliest and 98 points classify each pair of numbered angles corresponding, alternate interior, alternate exterior or none o these

To start to solve the system of equations below, which number would you multiply in the equation -2x-5y=-1? the two equations are -2x-5y=-1 and 4x+2y=8