Can anyone help?
find the value of X so that the polygons have the same perimeter

Find the solution of this system of equation -7x+y=-20 9x-3y=36

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values

Change negative exponents to positive. then solve. round to four decimal places