What is the distance between -6 and -3 on a number line?

Ifurniture stores having a weekend sale and is offering 20% discount on patio chairs and table the sales tax on furniture is 6.25 using function composition how can you represent the total amount a that you would need to pay for this furniture that cost x dollars

Me with this one question, and i'll upvote the brainliest answer

Adriveway is 40 yards long about how many meters long is it