Which equation is perpendicular to y=5/6x +1

Tiara buys the pizza shown below: a circular pizza is shown. the edge of one slice is marked ab. what does the curve ab represent?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?