I need the answer and explain please and thank you.

Use cos sin and tan and looks up rules of cos sin tan and it will show you the rules and use those methods to plug into your equation

30°

Explanation: so we know line F has to be 180° because it’s a line. it tells us the angle is 140°, so we know the interior angle is 40° because 180°-140°=40°. we also know that a triangle is 180°. so we have the two angles of the triangle: 110° and 40°. to find the third angle we find 110°+40°+?=180°. once we solve, we know the third angle is 30° because 180°-150°=30°.

hope this helped!

What the proper work