D If it’s not D than A sorry if I’m wrong
15/50 simplified would be 3/10 (divided by 5 on each side)
5/9 x 3/10 would be 15/90 or 1/6
1/4 divided by 3/5 would be 5/12, because when you divide fractions you flip the second fraction Ex: 1/4 divided by 3/5 would be 1/4 x 5/3
The prime factorization of 120 would be 2 x 2 x 2 x 3 x 5 or 2^3 x 3 x 5
(f-g)(x) is a shorthand way of saying that you need to get the difference of the two functions: f(x) and g(x). so essentially,
(f-g)(x) = f(x) - g(x)
= 5x+2 - (-3x+4)
= 8x-2
(f/g)(-2) = f(-2)/g(-2)
= -4/5 or -0.8
Hope this helps.