define the amplitude, period, frequency, horizontal shift, and vertical shift in the following equation, then graph. y=2.5sin(3x-pi)I was able to...

You are correct, as far as the numerical values of the
terms under reference in the problem that you arrived
at.

Please check whether your value for any paticular
values of x and y ( I mean coordinates) tallies with the book,since you might  have
drawn some part of the graph, and so apparently the graph  may look different even
though it is part of the  graph itself. Or the values of the coordinates points you
worked out may be different and the (points considered in the book are
different.

The starting point and the scale you chose also
makes the graph differ (flatness and shifts etc) in look.