Is f(x)=7-2x a polynomial function

On any given day, the number of users, u, that access a certain website can be represented by the inequality 1125-4530 which of the following represents the range of users that access the website each day? u> 95 or u < 155 95> u> 155 u< 95 or > 155 95

X-intercept=-5 y-intercept=2 the equation of the line is

Solve the equation by completing the square. x^2+2x=17