What does it mean to find the reciprocal?

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 .

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

3.4a=57.8 what is the the value of a