Explain how to use conversion ratios to convert 704 oz to pounds

What is the common difference in the following arithmetic sequence? 7,3,-1,-5

What is the simplified form of square root of 400 to the 100th power ?

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad