Hi there! :)
Answer:

We can disregard the units temporarily to create a ratio for 4.5 to 4:
4.5 is not a whole number- we can convert this number in the ratio to a whole number by multiplying both numbers by 2:
2 · (4.5 : 4) = 9 : 8
Express as a fraction:

Yes, all number sets are a real number
L = 2w
perimeter = 2l + 2w = 6w
6w = 54
w = 9
The first one is A and the second one is C
Is that simplified or combine like terms?
if its combined it would be -10d+4