Quelle quadrilatère ​

How is this equation completed? i cannot find any examples in the book.

What is the perimeter of an equilateral triangle if each side is (x+3)?

Anita has a success rate of 80% on free throws in basketball. she wants to know the estimated probability that she can make exactly four of five free throws in her next game. how can she simulate this scenario? categorize each simulation of this scenario as correct or incorrect.