What is the value of the expression below? 7 divided by 2 minus 4.5 x times 3 + 8

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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 border line of the linear inequality 4x + 7y < 5 is dotted true or false?