The student did not solve it correctly. They forgot to add the 5 foot height to the value of x.
The correct height is 23.4 feet, I know because I added 5 to the value of x.
Answer:
Parabolas have an axis of symmetry. If we assume that x=2 is that axis of symmetry, them that must mean the x values -2 and 6 should have the same y values, which they don't, thus an equation is not possible.
the answer is 5+x since it opened x years ago then they want to know how old in 5 years
The rate of change is D. 3.5