What is the perimeter of a quadrilateral with vertices at (3,-6), (8,-6), (3,-4), (8,-4)?

Given this information, which expression must represent the value of b?

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

Karen will divide her garden into equal parts. she will plant corn in 8/12 of the garden. what is the lowest number of parts she can divide her garden into?