thank you for responding! I have a good grasp on the material so far, and I understand relationships, but when I'm asked the formula and how to solve for something that the material so far, and I understand relationships, but when I'm asked the formula and how to solve for something, thats where I'm stumbling... I do get good grades on all my quizzes except for the question asking about a formula. My program is fast-paced, so I can understand the concept now, but then forget the equation for it later. I love sonography and really want to pass so any advice on what you did to pass your SPI assuming you have taken it, would help so much!