What is the opposite of 4.1

I really don't understand this concept can someone please help!

Can (2,3 and square root 10) be sides ona right triangle?

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

Which linear inequality is represented by the graph?