Need help with question 4 and 5

Polygon mnopq is dilated by a scale factor of 0.8 with the origin as the center of dilation, resulting in the image m′n′o′p′q′. the coordinates of point m are (2, 4), and the coordinates of point n are (3, 5). the slope of is .

What is sin 7x/4 ? i need on this urgent trig

Witch represents the inverse of the function f(x)=1/4x-12