12 + 3x = 30 // what is x?
3x = 18
x = 6
Perpendicular lines are lines that cross at a 90 degree angle
Lines AB and BC
First you need to solve for angle F then you can use 1/2acSinB. If you haven't done this you can also use the Pythagoras theorem and solve for the unknown side once you do that you can just use 1/2 b*h
5 bonus on 50 is 5/50 *100%=10%
5 bonus on 100 is 5/100 *100%=5%
Answer: for 50 points.