On a trip of 555 miles, an automobile consumed 55.5 gallons of gasoline costing $4.55 per gallon. What was the cost of gasoline per mile traveled?

0.455

Explanation:

555/55.5 mean 10 miles per gallon, take the price per gallon and divide it by 10. 4.55/10

i'm pretty sure it is letter c.) car

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.