Find the least common multiple of x2 – 2x – 15 and x2 + 2x – 3.


(x + 5)(x + 3)(x + 1)

(x – 5)(x + 1)(x + 3)

(x – 5)(x + 3)(x – 1)

(x + 3)(x – 1)(x + 5)

z varies inversely with the product of x and y. When x = 2 and y = 4, z = 0.5


What is the value of z when x = 4 and y = 9?


40

1/9

45/2

40/9