Can someone be kind to me on questions 29-30

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5