Answer: 
Step-by-step explanation:
You need to use this formula:
Where 
is the nth] term, 
is the first term,"n" is the term position and "d" is the common diference.
You must find the value of "d". Substitute 
, 
and 
into the formula and solve for "d":
Now, you can calculate the 25th term substituting into the formula these values:
and 
Then you get:
The rate is .38888888888888889 gallons a day because that is the result of 1.75/4.5. You can also round the answer to 0.4, which equals 2/5. Hope this helps!
