1/6 x 2/7 in simplest form

Proportions in triangles solve for x

Abc is dilated by a scale factor of 3 with the origin as the center of dilation, resulting in the image a'b'c'. if the slope of line ab is -1.2, what is the slope of line a'b'? a. -1.2b. 3.6c. 1.2d 1.8

You are given the first four terms of an arithmetic sequence. which one is best to use, recursive formula or explicit formula? why? pleasseee ! : (