Each term is the previous term multiplied by 1/4
128 * 1/4 = 32 = x
32 * 1/4 = 8 = y
x + y = 32 + 8 = 40
The 21st of January would be Sunday.
y = a(x-1)(x-5)
7 = 1(-1)(-5)
7 = 5a
a = 7/5
Therefore, the quadratic formula is y = (7/5)(x-1)(x-5)
The answer is 1/2