Answer:
the digit 4 in 3.546 is called hundredth because it is after the decimal point you add -th behind it while the digit 4 in 4.23 is called a unit
Hmmm idk if you want fractions but, 65/24 or 2 17/24 I think
1
2
2
5
2
3
0
3
^1
4
^2/2
Your answer is 4.88 using PEMDAS
2(2/5+1/5)=2•3/5=6/5=1 1/5
Answer is C