Calculator that shows work?

[Nausicaa]

I would love to have an app that shows work for something college level or at least high school level. My teacher is awful at teaching, so if I could use a calculator that actually knew what it was doing it would be awesome.

 

[Backnblack]

Like this?

Calculator with History Tape - Android app on AppBrain

 

[Nausicaa]

Thank you. I'm migrating from iPhone, and that is a great program, thank you for showing me. I am also looking for something that solves simple problems like on the iPhone they had:
115-in-1 Math Solver: Algebra, Geometry, Statistics, & Trig Calculator

I'm using Handycalc right now, but it has no formulas.