Answer:
Step-by-step explanation:
The sum of the angles in a triangle is always 180 degrees.
40+3x+180-5x+10=180
-2x+50=0
-2x=-50
x=25
Again using the fact that the angles must have a sum of 180
40+3x+a=180
40+3(25)+a=180
40+75+a=180
a+115=180
a=65
So angle 1 is 65 degrees.
