Which of the following is an even function?

a) f(x) = (x – 1)^2

b) f(x) = 8x

c) f(x) = x^2 – x

d) f(x) = 7

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

Which of the following is an equation of a line parallel to the equation y=4x+1?

Each year a store decreased the price of a certain model of tv by $35 . if the price in 2001 was $1950 , what was the price in 2009