The number 42 is 15% of x. what is the value of x ?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

If given an equation of a line such as -1/2x+6 how would you create an equation of a line parallel and perpendicula to this line that goes through another point such as (4,10)

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?