Type the correct answer in the box. Anna used 900 gallons of gasoline last year driving to and from work. This year, she changed jobs. She now uses only 600 gallons of gas annually.

If each gallon of gas releases 20 pounds of CO2 when burned, Anna reduced her CO2 emissions by %.

WILL MARK BRAINLIEST

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.