Pls help right now pls pls pls pls pls

Why do interests rates on loans to be lower in a weak economy than in a strong one

Can someone me with this problem i don't understand i need

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible