Once beautiful day in arendelle, you are trying to teach olaf about the different kinds of slope. you see a picture of the alphabet lying on the ground. you decide to use this to teach olaf all about the 4 kinds of slope: positive, negative, zero, and undefined. your job is to describe to olaf each type of slope using a different letter from the alphabet above. be specific because olaf gets confused easily. for example, you might say to olaf "look at the letter z. the middle part goes uphill and that's positive slope"