Divide 15 by 2, then square the amount.
(15/2)^2 = 225/4
X = t/2. t = 2x
y = 3t^3 - 1
y = 3(2x)^3 -1
y = 24x^3 -1
Answer:

Step-by-step explanation:

the cycle repeats every 4
19/4 = 4.75
16 is divisible by 4 plus three more
thus
but you problem has a minus in front so "i"
4000 for 4200
2000 for 2100
(If you meant a different answer please explain)