In rectangle JKLM, angle KLM is 4x + 10. Find the value of x.

Answer: x = 20
JKML is a rectangle => ∠KLM = 90°
⇔ 4x + 10 = 90
⇔ 4x = 80
⇔ x = 80/4
⇔ x = 20
Step-by-step explanation: