|AC|
------ = tan 25 deg, so |AC| = 8.6 tan 25 deg
8.6 8.6 (0.466) = 4.01 units (answer)
It is 15, as 20 is only a factor of 60 and not 75.
What I do in my school is Part over a Whole equals % over 100.
So the whole is 80, the percent is 80% over 100. We need to find the part so we cross multiply. 80×80% is 1600. Divide that by 100 and u get 16 points.
HOPE THAT HELPS!