How do I solve this equation and check the solutions?

Which is the graph of the function y=2(4)^x

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)