Interest on certain sum of money increase by 3/25of its every year and after 2years its amount is equal to 6272at compouded annually find the sum

The price of a particular stock is represented by the linear equation , where x represents the number of weeks the stock has been owned and y represents the price of the stock, in dollars. if this relationship continues, what is the price of the stock after it has been owned for 12 weeks? $92.55 $94.37 $100.52 $114.39

The parabola opens: y=√x-4 (principal square root) up down right left

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