Kyle and his brother have a marble set. of the marbles 12 are blue this represents 50/100of all the marbles. what decimal is equivalent to 50/100?

Can someone check my answer? you : )

Asap describe the transformations required to obtain the graph of the function f(x) from the graph of the function g(x). f(x)=-5.8sin x. g(x)=sin x. a: vertical stretch by a factor of 5.8, reflection across y-axis. b: vertical stretch by a factor of 5.8,reflection across x-axis. c: horizontal stretch by a factor of 5.8, reflection across x-axis. d: horizontal stretch by a factor of 5.8 reflection across y-axis.

How do you use the elimination method for this question? explain, because i really want to understand!