What transformation is made from f(x) → f(-x)

Ahigh definition tv cost $800 with a down payment of 2/5 of the cost. how much is left to pay, in dollars after the down payment has been made?

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document