If f(x) = (1/3)x + 9, which statement is always true?

(1) f(x) < 0 (3) if x < 0, then f(x) < 0.
(2) f(x) > 0 (4) if x > 0, then f(x) > 0.

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

Find the solution(s) to x^2-14+49=0

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove