Drag each tile to the table to multiply each row heading by each column heading

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Find the value of x for which the lines are parallel.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?