Answer:
x =7
Step-by-step explanation:
The sum of the angles is 90 degrees
4x+40 + 6x - 20 = 90
Combine like terms
10x +20 = 90
Subtract 20 from each side
10x +20 -20 = 90-20
10x = 70
Divide each side by 10
10x/10 = 70/10
x = 7
