Star problem?

You are in Louisville (latitude 38.25 degrees north). what are the smallest zenith distance and highest possible alttudes visible from Louisville for the following stars?
Declination 90 degrees N
Declination 70 Degrees N
Declinations 38 Degrees N
Declination 0

poornakumar b2015-01-27T04:15:02Z

i) Declination 90º N : 90º -38º.25 = 51º,75
ii) Declination 70º : (90º -38º.25)±(90º -70º) = 51º,75±20º, circumpolar
iii) Equator, decl. 0º : 38º.25
iv) Declination 38º : (38º.25 -38º) = 0º.25