Says find the measure of the indicated angle need to show work

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.

Evaluate cos2θ for cosθ = square root of 3/2

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)