Yo can I get some help with this problem

Why do interests rates on loans to be lower in a weak economy than in a strong one

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

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?