Lumpy an stumpy have 60 rocks althougher. Lumpy has 9 more then twice Stump. How many foes each have? Please answer

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

Simply 8x squared + 5(7x squared- x) - 2x =

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