Are -5/10 and -4/8 equivalent

Will give let f(x)=2x and g(x)=[tex]2^{x}[/tex] graph the functions on the same coordinate plane. what are the solutions to the equation f(x)=g(x) ? enter your answers in the boxes x=[? ] or x=[? ]

In a column proof the right column states your reasons

Tan198=asin164=? how to solve this? ?