1. The problem statement, all variables and given/known data Guy records data of person using a swing. Comes up with an equation to show his findings: y = 1.6sin(1.8x - 0.9) + 2.5 What does each number represent in relation to the situation (person swinging)? 2. Relevant equations Don't think any equations are needed for this. But it's good to know that above equation is derived from y = asin(bx - c) + d a - vertical stretch/shrink b - horizontal stretch/shrink c - horizontal shift d - vertical shift 3. The attempt at a solution This one's been killin me. Since the variable 'd' represents the vertical shift, I was guessing the 1.6 may represent the distance the person's off of the ground. And since 'a' is the vertical stretch/shrink, maybe that could represent the maximum height or something. I have no idea what 'b' and 'c' will represent.