How do you find the angle between two vectors?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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. after tax the total is 45.99. what percentage of the subtotal is the total?

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41