Use the

on your calculator. Also make sure the calculator is in degree mode. You should get 23.32°
First find angle EBC.
The are for a triangle is 180 degrees.
It is a right triangle and has a right angle.
180 - (90 + 50)
180 - 140
angle EBC IS 40
NOW FIND X
The line is 180 degrees.
180 -40 = 140
X = 140 DEGREES
Hey there!
Ty rode is bike 54 miles.
Work:
4.5 x 12
Hope this helps!