Help thank u so much thanks

7.5, 7.058, 8.508,

8.58

Step-by-step explanation:

1. 8.58, 8.508, 7.5, 7.058

2. 439.612, 439.261, 439.216, 439.126

Step-by-step explanation:

Prioritize the numbers that have a higher digit at a higher position. Just for fun:

In[1]:= ReverseSort[{8.508, 8.58, 7.5, 7.058}]

Out[1]= {8.58, 8.508, 7.5, 7.058}

In[2]:= ReverseSort[{439.216, 439.126, 439.612, 439.261}]

Out[2]= {439.612, 439.261, 439.216, 439.126}

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.