Please help me with these​

Use set builder notation to represent the following set: { -3, -2, -1, 0}

The spring the owner of a sporting good store decreases the price of winter gloves from $10 to $8 each increases the price of swimming goggles from $8 to $10 without doing the math you think the percent decrease in the price of the gloves the same as the percent increase of the goggles explain why or why not

4+(2+x) can you me solve this problem