Can some one me with this question answer what is 40%of 320

Asequence of numbers begins with 12 and progresses geometrically. each number is the previous number divided by 2. which value can be used as the common ratio in an explicit formula that represents the sequence? 1/2 2 6 12

How do you write y-10=2 (x-8) in standard form

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i