Arectangle has a hight to width ratio of 3: 4.5 give two examples of dimensions for rectangles that could be scaled versions of this rectangle

I'm confused on this could anyone me and show me what i need to do to solve it.

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244

If f(x) = 5х – 2 and g(x) = 2х + 1, find (f – g)(x).