Wich is bigger half of 40 or one fourth of 20?

Answer this question only if you know the answer! 30 points and

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle