A picture frame can hold a 12 in by 8 in picture. The area of the entire frame, including the border, is 192 square inches. Find the width of the frame. Please use the quadratic formula and just get it in standard form. Thanks!

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

What is negative 3/9 times negative 2/8 ?