20 divided by 4 1/2 (last one) will give brainlist if give a step by step, and will give points.

4.4...

Step-by-step explanation:

20 ÷ 4 1/2

let's change 4 1/2 into an improper fraction.

20 ÷ 9/2

20 is the same thing as 20/1, so we'll express it that way.

÷

in order to divide fractions, you must multiply the first number (20/1) by the inverse of the second number (2/9). I'll put it in normal fraction form for clarity.

20      2

---   ×  ---

1          9

now we multiply straight across.

40

----

9

now we have 40 ÷ 9, which is 4.444...

so your answer is 4.4...

{also 4.4 with a repeating bar (tiny line over the .4)}