Okay kiddo, let's talk about regressive delta. You know how sometimes when you pour water into a cup, the water level rises? Well, the amount the water level rises is called delta. Now, regressive delta is a bit different. It happens when something is taken away from the cup, like when you drink water and the level goes down.
But regressive delta is not just about cups and water. It's also used in math and science, especially when we are looking at changes over time. For example, let's say you had 10 pieces of candy yesterday, and today you only have 8. The change in your candy might be called a regressive delta, because you had less today than you did before.
So, regressive delta is all about when something decreases or goes down. It's like the opposite of when things increase or go up. And now you know what regressive delta means, just like a big kid!