1) http://web2.0calc.com/questions/omg-hard-plz-hlp
2) http://web2.0calc.com/questions/physics-problem_2 Alan has answered this one :)
3) http://web2.0calc.com/questions/what-about-the-integrals-more-simply-i-can-t-seem-to-find-a-way-to-incorporate-the-integral-into-my-equation-so-that-this-calculator-ca
4) http://web2.0calc.com/questions/1-calculate-what-the-future-size-of-the-population-will-be-given-a-specific-initial-population-rate-of-growth-and-time-interval-use-the
Took care of one!
thanks Happy