Cho A = {x ϵ N | x < 20 và x chia hết cho 3}.Hãy liệt kê các phần tử của A.

1. x=28

2. FJ=66

3. FG=180

Step-by-step explanation:

1. FJ and JG equal 180 degrees so you set up the equation like so 2x+10+4x+2=180. Then you can solve for x which is 28.

2. You substitute 28 for x to find the answer.

3. We already found the answer to this in the first question but you still can substitute 28 in for x in both the expressions and then add them.