Each interior angle = 540/5= 108
Explanation:
If you plug 4 in for x into the equation, the equation becomes this:

When you simplify the equation;

Simplify it further,

That is correct. 6 = 6
Hope that answered the question.
Answer: No, they are not.
Step-by-step explanation: To see if ratios are equivalent, you have to simplify them. 6:4 can be simplified to 3:2 but 19:12 cannot be simplified anymore. Since 3:2 is not equal to 19:12, they are not equivalent.