X^(4)-3x^(3)+19x^(2)+53x-174=0

Which function has the smallest y-intercept value

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.