F(x)=x2-10x+16 how do I solve that ​

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

The monetary value earned for selling goods or services to customers is called a.) revenue b.) assets c.) money d.) accounting