funtion y = a √[b(x-h)] + k help please.it has (-2,3),(-1,-1),(1,-4),(2,-5) graph.?

a.determine the equation of this function if there is a vertical stretch factor and no horizontal stretch factor
b.determine the domain and range of this function
c.determine the equation of this function is there a horizontal stretch factor and no vertical stretch factor.
please provide detail.thank you