In the figure, m∠1 = (7x+7)°, m∠2 = (5x+14)°, and m∠4 = (13x

Last updated: 8/14/2022

In the figure, m∠1 = (7x+7)°, m∠2 = (5x+14)°, and m∠4 = (13x +9)°. Your friend incorrectly says that m∠4 = 15°. What is m∠4? What mistake might your friend have made?