The first one is 4
Second is 5/9
Third is 1/2
Fourth is 11
For this case we have:
By trigonometric property we have:

Where:

Substituting:

Clearing x we have:

Thus, the equation is: 
Answer:

Finding the perimetre: 7x+4x-3+x=12x-3
Good luck!
Parks wants to share her point of view about a challenging time in history. ... She also uses chronological structures to explain the order of events that she narrates in MY STORY. Her memoir let's her share her first-person perspective in a way that other types of narration cannot.