Find the length of the line segment AB if the coordinates of the endpoints are A(-1, 5) and B(3, 11)

Asporting good store is offering 30 percent off of the original price(x) of football cleats. the discount will be reduced by an another $7 before sales tax.

Me because i don't understand how to do it.: )

Zoe paid $18.60 in sales tax in tips for her dinner the sales tax rate is 11% and she tipped 20% what was the price of zoe’s dinner before sales tax and tips