calculator that can transpose formulae

Hello everybody..

im a first year university student studying aeronautical and mechanical engineering. I was never taught maths at school as i was put in the lower group with all the trouble making kids. So as soon as i got to uni they expect me to know everything maths wise and i dont. Thats why im here (Rofl)

my first question is:-

is anybody aware of a hand held calculator (can be taken into exams) that has the ability to transpose formulae?

thanks in advance

alex