a)check out my definitions, please mention if they are wrong..
amplitude is the distant between a max and min (i.e. 4.5-1 =3.5)
length of a periodic cycle = period (i.e.3.5pi - (-.5pi))
horizontal shift = horizontal shift from the normal sin wave (i.e. amplitude/2-1)
vertical shift= when y=horizontal shift , the least value of x