ok so the veloctiy is:

v(t) = (-2sint)i + (3cost)j +4k

so to find the speed you do

squareroot((-2sint)^2 + (3cost)^2 +(4k)^2)

=

squareroot(4sin^2t + 9cos^2t + 16k^2)

the book says the speed is 2 * squaroot(5)

i have no idea how to get that from where i left it off.