A recipe says to use 3 cups of flour to make 48 cookies what is the constant of proportionality that relates the number of cookies made, y , to the number of cups of flour used please help me​

Reflect the point (7,0) across the y-axis

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?

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?