Answer:
61
Explanation:
No worries, so we know the sum of interior angles of triangle is 180 degrees. Let's set that up
2x+16+42=180 (now this becomes an algebra problem where you add 42+16 and subtract it from 180)
2x= 180-58
2x=122 (divide by 2 on both sides to get x by itself)
x= 61