What is the measure of ∠B?

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

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

If you could answer these your a life saver