7*10^7/2*10^5 write your answer as a scientific notation

there's a picture attached if you want to see the orginal question

Apackage of bacon holds 15 strips of bacon. the pancake house uses 17 packages of bacon in the morning and 21 packages in the afternoon. how many more strips were used in the afternoon than the morning?

Which of the choices shown could be used to prove that aacp=abcp ?

The distance between two cities is 368 miles. if the scale on the map is 1/4 inch=23 miles, what is the distance between the cities on the map?