Sure, no problem!
Are the acting tsudents allowed to sing at the showcase?
It is very rare that acting majors get to sing in the showcase, and it is not up to the student, it is up to the director of the showcase. In other words, if you are an acting major, don't go into the program expecting to sing at senior showcase.
how much is the additional fee for voice lessons?
It varies from teacher to teacher. I think its around $40 an hour, but don't quote me.
do acting majors, if qualified, often change to MT even though they were not admitted to MT?
They hold auditions at the beginning of freshman year for actors who want to try and change to MT. Some years one or two actors are admitted, some years none are admitted. Again, there is no promise.