Answer:
So, total gallons were made in all =9.31 gallons
Explanation:
We are given 
A scientist repeated an experiment three times, making 1.42, 3.81, and 4.08 gallons of a new product
so, 
first experiment =1.42 gallons
Second experiment =3.81 gallons
Third experiment =4.08 gallons
now, we can find total gallons
total gallons = first experiment + second experiment + third experiment
total gallons =1.42 gallons + 3.81 gallons +4.08 gallons 
total gallons =9.31 gallons