Anumber is42,300 when you multiplied by 10. find the product of this number and 500

Need on this geometry question. explain how you did it.

What multiplys to be 1 but adds up to be 4

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