I don't understand how to solve Sequence dots? Can you show me step by step how to solve the first one A?

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 the 12th term of b(n)=-4-2(n-1)

Can someone me and explain..will award brainlest!