1/8 of 3 is 24. So he had 24 books in all.
I assume you mean divide using the conjugate to rationalize the denominator and express the result in standard rectangular form.

Identify the slope, m. This can be done by calculating the slope between two known points of the line using the slope formula.
Find the y-intercept. This can be done by substituting the slope and the coordinates of a point (x, y) on the line in the slope-intercept formula and then solve for b.
77 green marbles
try googling the rest or 33/77=77%