Answer:
x= 19
Step-by-step explanation:
We know this a 90 degree angle and we already have 59 degree as on part of the angle so the equation to set this up is (x+12) + 59= 90
12+59= 71
x+71=90 subtract 71 and whatever you do to one side do to the other.
90-71= 19
x=19
