How do I find ordered pair describes location of point x

What are the domain and range of the function f(x)=2^x+1

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?