Which of the following equations does not represent a linear function?

a. y=-x
b. y=x+4
c. y=1/2x
d. y=7^3+1

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)

Find the zeros of each function. f(x) = 6x^2 - 7x - 20