After searching this site, I found that all4 problems are listed there, along with their solutions! You should have heard me scream! Yay! I don't have to spend all weekend looking for answers! :-)
Now you just have to pray that that wasn't part of your test, seeing if you could get your answers via internet!
Maybe your teacher expected this and this is why those questions were given too you, come test time all new questions and no internet for answers!!! OH NO!!!!!!!!
I wouldn't put it past a teacher, my 11 year old daughter had her teacher do this, gave her the test to do at home, knowing that the kids would try and find the answers via the web, and the following day gave a different test with different problems that had to be figured the same way. The kids who took the test without internet help past (my daughter) the ones who used the internet sat starring blankly at the wall! ;D

At first I thought this a unusual practice until I figured it out, if a child can get all the answers from the internet they aren't applying thier mind to the task at hand.
Which i think the internet is a awesome learning tool if used for that purpose, but it seems kids today will be in a shock when they enter the working world and find that all thier problems at work can't be solved by a click of a button!