Thermodynamics Physics hw help?

The volume expansion for gasoline if 950 x 10^-6 K^-1. Gasoline if sold by volume, usually measured in liters. When would it be most economical to purchase gasoline sold this way?

(i) when the gasoline is cold

(ii) when the gasoline is warm

(iii) temperature of gasoline wouldn't make a difference

When a 100 m metal pipe is heated from 20 Celsius to 43.5 Celsius, it lengthens by 4 cm. What type of pipe is this?

(i) aluminum

(ii) brass

(iii) copper

(iv) gold

Which of the following bimetallic strips will exhibit the greatest sensitivity to temperature changes? That is, which one will bend the most as temperature increases?

(i) copper on steel

(ii) steel on aluminum

(iii) copper on aluminum

(iv) aluminum on brass

(v) copper on brass