Which arrangement shows 3 1/8 , 3.7, 3 3/4 , and 3.89 in order from least to greatest?

So first, you need to get them all in the same form. Let's go with decimals. So 3 1/8= 3.125, 3.7=3.7, 3 3/4= 3.75, 3.89=3.89
now you have these: 3.125, 3.7, 3.75, 3.89.
These are already in order from least to greatest. 
so the arrangement is 3 1/8, 3.7, 3 3/4, 3.89.